Why Are Microbial Enzymes for the Production of Many Pharmaceutical

Why are microbial enzymes for the production of many pharmaceutical drugs sometimes favored over chemical synthesis?

A) Microbial enzymes catalyze stereospecific reactions.
B) Microbial enzymes are easier to obtain.
C) Microbial enzymes are cheaper to produce.
D) Microbial enzymes are more temperature sensitive.
E) Microbial enzymes catalyze the reaction at a faster rates.