Hairlessness in Dogs Is Inherited from a Single Dominant Allele

Hairlessness in dogs is inherited from a single dominant allele.Inheriting two dominant alleles is lethal for the embryo.Penelope,a hairless dog,is wildly attracted to a hairy dog,Arnold.They mate.The probability that Arnold's sperm fertilizing Penelope's oocyte conceives a pup that would be hairless like Penelope is

A) 3/4.
B) 1/3.
C) 2/3.
D) 1/4.
E) 1/2.