[单选题]
If a person's eyebalor+9o l7bx)wz/ zwue0vm5 jxtrh ,bqqyk* ee-9n2;c :l is too short from front to back, the person is likely to suffer frtvc5r:km,h qe*yqb9xj-2; ne om
A. astigmatism.
B. spherical aberration.
C. farsightedness.
D. nearsightedness.
