Inside a Cell,the Cytoplasm Is Generally Maintained at a PH

Multiple Choice

Inside a cell,the cytoplasm is generally maintained at a pH around 7.This might be so because

A) buffers work best when the pH is close to 7.
B) humans are largely made up of water by weight.
C) most chemical reactions that occur in the cytoplasm can proceed optimally at pH 7.
D) ionic bonds cannot form at pH 7.