Adam Bassett, 50 years old, visits the health clinic for a complete physical examination. Past medical history includes a recent ear infection. He denies any current ear pain, headaches, fever, or vomiting but says his ear still feels "full". He has noticed that he has blurred vision, especially when reading the newspaper. He does not wear corrective lenses and his last eye examination was 10 years ago. Mrs. Bassett accompanied her husband to the examination and says she feels her husband does not hear as well as he once did because she finds she often has to repeat things to him.

the vision screening has determined that Mr. Bassett has become farsighted. what is the best explanation for this new development?
A. as people get older, muscles have difficulty holding the visual axis
B. as people get older, the ciliary muscle is more contracted, thus causing the lens to bulge
C. as people get older, the lenses lose their elasticity and their ability to bulge
D. as people get older, the ability to constrict the pupil when focusing on near objects is lost