In some chickens, feather color is controlled by incomplete dominance. When a black chicken mates with a white chicken, all the offspring are covered in gray feathers.

A farmer mates a black chicken (BB) with a gray (BW) chicken.

What are the predicted phenotypes of their offspring?

a
100% gray
b
50% black and 50% gray
c
100% white
d
75% black and 25% white