What Causes the "Blind Spot" in the Vision of Both

Multiple Choice

What causes the "blind spot" in the vision of both eyes?

A) The inconsistent surface of the cornea.
B) The folded area of the fovea that occurs where the cones are the most dense.
C) The optic nerve passing through the retina as it leaves the eye.
D) The concentration of ganglion cells in the center of the optic nerve blocking light.