Refer to the Following Information to Answer the Questions Below

Multiple Choice

Refer to the following information to answer the questions below.
A man who is an achondroplastic dwarf with normal vision marries a colour-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green colour blindness is X-linked recessive.
-They have a daughter who is a dwarf with normal colour vision. What is the probability that she is heterozygous for both genes?

A) 0%
B) 25%
C) 50%
D) 75%
E) 100%