 1DiamonDragon1 
                                                21.04.2020 10:26
                                                
                                                1DiamonDragon1 
                                                21.04.2020 10:26
                                             илья1949 
                                                21.04.2020 10:26
                                                
                                                илья1949 
                                                21.04.2020 10:26
                                             YourKarma396 
                                                21.04.2020 10:26
                                                
                                                YourKarma396 
                                                21.04.2020 10:26
                                             terminator27 
                                                21.04.2020 10:26
                                                
                                                terminator27 
                                                21.04.2020 10:26
                                             ebusuruna 
                                                21.04.2020 10:26
                                                
                                                ebusuruna 
                                                21.04.2020 10:26
                                             1234567890Плюша 
                                                21.04.2020 10:26
                                                
                                                1234567890Плюша 
                                                21.04.2020 10:26
                                             olgazdobickaya1 
                                                05.03.2020 12:08
                                                
                                                olgazdobickaya1 
                                                05.03.2020 12:08
                                             али421 
                                                05.03.2020 12:06
                                                
                                                али421 
                                                05.03.2020 12:06
                                             Anna06111 
                                                05.03.2020 12:06
                                                
                                                Anna06111 
                                                05.03.2020 12:06
                                             surikat235 
                                                05.03.2020 12:09
                                                
                                                surikat235 
                                                05.03.2020 12:09
                                            
In reported speech, we need to change the tense and pronouns accordingly. The reporting verb "wanted to know" indicates that the reported speech should be in the past tense.
a) Jennifer wanted to know where I played football.
The correct answer. We use the past simple tense "played" because the question was asking about a habitual action.
b) Jennifer wanted to know where I had played football.
This sentence is incorrect. We use the past perfect tense ("had played") when we want to talk about a completed action before a specific point in the past. It does not fit in this context.
c) Jennifer wanted to know where did I play football.
This sentence is also incorrect. In reported speech, we do not use an auxiliary verb like "did" in a question. Instead, we use the word order of a statement, so the correct structure would be "Jennifer wanted to know where I play football."
d) Jennifer wanted to know if I played football.
This sentence is incorrect. The original question already asked "where," not "if." So the correct structure in reported speech is "Jennifer wanted to know where I play football."
Therefore, the correct answer is: a) Jennifer wanted to know where I played football.