Although Identical Twins Have Been Shown to Have Some Amazing

Although identical twins have been shown to have some amazing psychological similarities, one should be cautious about attributing these similarities to genetic factors because

A) the twins may have been raised in completely different environments.
B) genetic factors influence physical, not psychological, characteristics.
C) any two strangers are likely to share a string of coincidental similarities.
D) many fraternal twins have been shown to be psychologically different from each other.