Amanda has no visual impairments, but has noticed that in order to see clearly she must hold books farther from her face in order to read. What is happening to Amanda's vision?
A. Her lens is becoming more opaque with age.
B. Her vitreous humor is becoming thicker with age.
C. Her lens is becoming more flexible with age.
D. Her lens is becoming more rigid with age.
E. Her lens is becoming more convex with age.
Answer: D
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