Moving from the Fovea to the Outer Margins of the Retina

Multiple Choice

 Moving from the fovea to the outer margins of the retina,

A) rods and cones are evenly distributed.
B) the concentration of rods decreases and the concentration of cones increases.
C) the concentration of cones decreases and the concentration of rods increases.
D) rods and cones are concentrated in distinct clusters.