Which of the following statements best explains why sheep X has black wool?
a. Black wool is a recessive trait, and sheep X is heterozygous for wool color.
b. Black wool is a dominant trait, and sheep X is homozygous dominant for wool color.
c. Black wool is a dominant trait, and sheep X is heterozygous for wool color.
d. Black wool is a recessive trait, and sheep X is homozygous recessive for wool color.