Question

__________ is/are used by the body to synthesize Vitamin D, maintain the proper functioning of nerve cells, keep skin soft and supple, and transport fat to cells.

A. amino acids
B. Cholesterol
C. Vitamins

Answer 1

I'm not quite sure but it could be cholesterol

Answer 2

A, amino acids are used to synthesise vitamin D. that's all I know. Have a good day :)