In 1910, Thomas Hunt Morgan Discovered a White-Eyed Fruit Fly

In 1910, Thomas Hunt Morgan discovered a white-eyed fruit fly in his population of wild-type, red-eyed flies. This white-eye phenotype occurs:

A) in all male and female fruit flies every other generation.
B) only in female fruit flies.
C) only in male fruit flies.
D) only in one-half of female offspring from a white-eyed male and a red-eyed homozygous female.
E) in one-half of the male offspring from a red-eyed heterozygous female and a white-eyed male.