Answer: D. They have more rod cells.
Animal eye has two photoreceptor cells rods and cones present in their retinas. Rods are cells which are sensitive to light and cones are responsible for detection of color both are necessary for proper vision. The animals which hunt during night suffer from low availability of light from moon as compared to those animals which hunt in sunlight. Therefore, more number of rod cells in the retinas of night hunting animals will allow them to see in low light conditions.