Although She Is Normally Not Aware of Its Existence, Ingrid

Multiple Choice

Although she is normally not aware of its existence, Ingrid discovers that she has a blind spot in her vision by closing one eye and focusing on a fixed point. What explains why Ingrid has this blind spot in her vision?

A) She suffers from retinal degeneration.
B) She is experiencing sensory adaptation.
C) No photoreceptors are located where the optic nerve leaves the eye.
D) There is insufficient light to activate her rods.