Clark's eyes are brown in color. However, both his parents have eyes that are blue in color. According to the dominant-recessive genes principle, the most likely reason for Clark's eyes being brown in color is that
A. Clark's grandparents had brown-colored eyes.
B. Clark's parents are carriers of genes contributing to brown eyes.
C. Clark has a mutation in his genotype resulting in the change in eye color.
D. Clark's family history shows that the family has a dominant gene for brown-colored eyes.
Answer: B
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