All of the following are functions of electrolytes in the body except
a) control osmosis of water between fluid compartments.
b) act as enzymes in some metabolic pathways.
c) serve as enzyme cofactors.
d) maintain acid-base balance.
e) carry electrical current.

Option (B).

Explanation:

Electrolytes may be defined as the important minerals that plays an important role in organism. The deficiency or imbalance of electrolytes in the body may causes a characteristic disease.

The electrolytes are important to balance the amount of water in body, can acts as a co factor, carries electrical current and maintain the acid base balance of the body.  The electrolytes are not used as an enzyme as enzymes are made up of protein.

Thus, the correct answer is option (B).

not too sure but maybe in the hot springs.