The most light-sensitive receptor cells are the

A) ganglion cells.
B) cones.
C) bipolar cells.
D) rods.

Rods are the most light-sensitive receptor cells and are responsible for vision in low-light conditions. Cones, on the other hand, are responsible for color vision and function best in bright conditions. Bipolar cells and ganglion cells are both involved in the transmission of signals from the photoreceptor cells to the optic nerve, but they are not the most light-sensitive cells.