Could anyone help me with these two questions?

1. All of the below describe an enzyme EXCEPT which condition?
A. It is consumed during the reaction.
B. It binds with a substrate forming an enzyme-substrate complex.
C. It reduces the amount of energy required by a reaction.
D. It yields products that are different than the original substrate.

2. Unsuitable pHs to the particular enzyme results in what?
A. Faster enzymatic activity
B. Greater enzymatic activity
C. Less enzymatic activity
D. Denaturation of the enzyme