Black Fur in Mice (B)is Dominant to Brown Fur (B)

Multiple Choice

Black fur in mice (B) is dominant to brown fur (b) . Short tails (T) are dominant to long tails (t) . What fraction of the progeny of crosses BbTt × BBtt will be expected to have black fur and long tails?

A) 1/16
B) 3/16
C) 3/8
D) 1/2
E) 9/16