Shane and Blane Are Identical (Monozygotic)twins; However,people Seldom Get the Two

Multiple Choice

Shane and Blane are identical (monozygotic) twins; however,people seldom get the two brothers mixed up because Blane is almost 2 inches shorter than Shane.The difference in height means that

A) even though both brothers display the same phenotype, they have different genotypes.
B) because the brothers display different phenotypes, they must also have different underlying genotypes.
C) even though both brothers share the same genotype, they display different phenotypes.
D) Blane is heterozygous for the "tallness" trait, and Shane is homozygous for the "tallness" trait.