Epistasis Is the Masking of the Expression of One Gene

Multiple Choice

Epistasis is the masking of the expression of one gene by another gene at a different locus. The epistatic gene does the masking; the hypostatic gene is masked. Epistatic genes can be dominant or recessive.
-A number of all-white cats are crossed and they produce the following types of progeny: 12/16 all-white, 3/16 black, and 1/16 gray. What is the genotype of the black progeny?

A) Aa
B) Aa Bb
C) A_ B_
D) A_ bb