Which statements about enzymes are correct?

1 )enzymes are proteins.
2 )some enzymes carry out chemical digestion.
3 )enzymes speed up the rate of chemical reactions. 4 )all enzymes work fastest at ph 7.

a )1, 2 and 3
b )1 and 2 only
c )1 and 3 only
d )2, 3 and 4

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