In horses, the dominant allele of the C gene causes gray color with early graying and is epistatic with respect to the dominant

In horses, the dominant allele of the C gene causes gray color with early graying and is epistatic with respect to the dominant allele of gene B, which determines the black color, and the b allele, which determines the red color. The recessive allele c does not affect the expression of coat color in horses. What is the probability of the birth of a gray foal from crossing a red mare with a heterozygous black stallion?

The probability of the birth of a gray foal from crosses of a red mare with a heterozygous black stallion is 0%.