Two Parents with a Dominant Trait Have a Child Who

Two parents with a dominant trait have a child who shows the normal phenotype. What is the chance that that child is a carrier of the trait?

A) the chance that an unaffected child is a carrier is less than 50%
B) the chance that an unaffected child is a carrier is 50%
C) the chance that an unaffected child is a carrier is 0%
D) the chance that an unaffected child is a carrier is 75%
E) the chance that an unaffected child is a carrier is 2/3