Assume Eight Different Strains of Fly Have Been Isolated, Each

Multiple Choice

Assume eight different strains of fly have been isolated, each shows a recessive white eye trait.Crosses are performed as follows (w) indicates white-eyed progeny, (R) indicates wild-type red eyes. Based on these crosses, how many different genes are present and what strains have mutations in the same gene as does strain A?

A) 2, B, E, and H
B) 3, B, and C
C) 3, B, C, and H
D) 3, B, E, and H
E) 4, B, and H