A Hypothetical Cross Between Two Fruit Flies,one with Red Eyes

a hypothetical cross between two fruit flies,one with red eyes and one with white eyes,all resulting progeny had red eyes.This would suggest that

A) The red-eyed trait is recessive to white eyes.
B) The red-eyed trait is dominant to white eyes.
C) The red-eyed and white-eyed genes are co-dominant.
D) The eye color trait is most likely coded for by multiple genes.
E) None of the above.