In Dogs,there Is a Hereditary Deafness Caused by a Recessive

In dogs,there is a hereditary deafness caused by a recessive allele,d.A kennel owner has a male dog that she wants to use for breeding purposes if possible.The dog can hear,but the owner is unsure of the genotype.She does a testcross (crosses it to a homozygous recessive dog) ,and two of the five offspring are deaf.This means that the male dog

A) has the genotype Dd
B) has the genotype DD
C) has the genotype dd
D) is actually deaf
E) is still of unknown genotype since there were offspring of both deaf and hearing phenotypes