Melinda and Joseph Both Have Brown Eyes, but Their Child

Multiple Choice

Melinda and Joseph both have brown eyes, but their child has blue eyes. This shows that

A) both Melinda and Joseph are carrying a recessive gene for blue eyes.
B) either Melinda or Joseph is carrying a recessive gene for blue eyes.
C) both Melinda and Joseph are carrying a dominant gene for blue eyes.
D) either Melinda or Joseph is carrying a dominant gene for blue eyes.