One Parent Has One Copy of a Dominant Allele for Gene

Multiple Choice

One parent has one copy of a dominant allele for gene 87 and one recessive allele for Gene 87.The other parent has two copies of the recessive allele for Gene 87.What is the chance that their children will inherit the dominant condition (two copies of Gene 87) ? You may need to draw a Punnett square to figure this out.

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