Question

potassium is involved in
a maintaining fluid balance.
b regulation of bone mineral density.
c prevention of xerophthalmia.
d all of the above.

Explanation:

Potassium is an important electrolyte that helps in maintaining fluid - electrolyte balance in the body. Bone mineral density is mainly related to calcium, phosphorus, and vitamin D. Xerophthalmia is caused by vitamin A deficiency. So potassium is involved in maintaining fluid balance.

Answer:

A. maintaining fluid balance