Which vitamin plays a primary role in vision and the development of body cells?
a. vitamin a
b. vitamin b6
c. vitamin c
d. vitamin d

The correct answer is A) Vitamin A.

Vitamin A is a fat soluble vitamin that plays significant role in normal vision as well as development of the body cells.

Vitamin A is also called retinol because it produces a light absorbing pigment in the retina that is called rhodopsin ( formed by combining retinal and opsin). This pigment is essential for both color vision as well as vision  in the dim light ( scotopic).

This vitamin also functions as retinoic acid ( produced by oxidation of retinol) that is considered as a hormone like growth factor for epithelial and several other types of cells present in the body.

Thus, option A) is the right answer.

it restores trees to areas where they once grew.

biology is the study of life. it is the study of living organism.