In poodles, black is dominant to white. A black poodle is crossed with a white poodle. In a litter of four, all of the puppies are black. What is the best conclusion?

A、The black poodle is definitely homozygous.;
B、The black poodle is probably homozygous;
C、The black poodle is definitely heterozygous.;
D、The black poodle is probably heterozygous.