An Older Man Tells a Nurse, "The Doctor Says I

An older man tells a nurse, "The doctor says I have something wrong with my eyes, something called presbyopia. Can you explain why I have this? I was always fortunate to have good eyesight." The nurse formulates a response based on the knowledge that:

A) the lens of the eye loses elasticity causing a loss of focus for near objects.
B) the cornea of the eye becomes thicker and less curved causing an increase in astigmatism.
C) the lens of the eye increases in opacity causing a decrease in light refraction.
D) the cornea of the eye forms a gray ring at the edges.