A test cross was made between two Alaskan malamutes, a dominant phenotype for normal

QUESTION:

A test cross was made between two Alaskan malamutes, a dominant phenotype for normal size and a homozygous recessive dwarf. Which of these results would indicate that the normal-sized dog is heterozygous? A. All puppies were phenotypically dominant. B. All puppies were phenotypically recessive. C. Some puppies were phenotypically dominant and some were recessive. D. none of the above