Bart, Age 40, Asks His Doctor About What Sensory Changes

Bart, age 40, asks his doctor about what sensory changes he should expect. The doctor will most likely tell him that:

A) his vision will decline in his 50s, while his hearing has been declining for 20 years
B) both his vision and his hearing will begin to decline in the next five years
C) neither his vision nor his hearing will begin declining until he reaches age 50
D) his hearing will decline in his 50s, while his vision has been declining for 20 years