Vitamin a Plays a Critical Role in Night Vision Because

Vitamin A plays a critical role in night vision because:

A) it is required for the synthesis of the retinal portion of rhodopsin.
B) it is transformed into the opsins found in cone cells.
C) it acts a coenzyme in the reaction that degrades cGMP within rod cells.
D) it catalyzes the mitotic generation of light-reflecting epithelial cells, which support widely dispersed rod receptors.
E) it is a key intermediate in the signal transduction pathway within cone cells that is activated by light.