[单选题]
If a person's eyebal s:nidp91 )8 er9 ,dr4 /vu,rswkwmvxgl is too short from cxo/v-i f( (cb8+u3ydty8oyor)9 lk yfront to back, the person is likely to sdy8o3i )/y y(ro+98oyl( b kvf-xcuct uffer from
A. astigmatism.
B. spherical aberration.
C. farsightedness.
D. nearsightedness.