If You Had a Black Male Guinea Pig and Brown

If you had a black male guinea pig and brown female guinea pig,but you didn't know which was the dominant characteristic,how would you find out the dominant color,assuming the dominant characteristic is homozygous,?

A) Mate them and see what color the offspring are-that will be the dominant color.
B) Mate them and see what color the offspring are-the other will be the dominant color.
C) Mate them,and then mate their offspring to see what color the next generation is-that will be the dominant color.
D) Mate them together,and then mate their offspring to see what color the next generation is-the other color will be the dominant color.
E) The dominant color could not be determined by mating the two,and then mating their offspring; further generations would have to be produced to determine the dominant color.