In a Species of Mice, Short Hair Is Dominant to Long

Multiple Choice

In a species of mice, short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

A) the short-haired individual is homozygous.
B) the long-haired individual is heterozygous.
C) the long-haired individual is homozygous.
D) the short-haired individual is heterozygous.
E) This cannot be answered without more information.