Which Statement Best Characterizes the Contrasts Between Axon Guidance in the Developing

Which statement best characterizes the contrasts between axon guidance in the developing spinal cord and retina?

A) Ephrins serve as the primary repulsive cue in both tissues.
B) Axon guidance toward the floor plate relies primarily on substrate-bound axon guidance molecules.
C) Axon guidance in the retina is very specific, whereas it is relatively indiscriminate in the spinal cord.
D) Growth toward both the floor plate and retina involve repulsion.