Which Statement Best Supports the Claim That Environmental Factors Played

Multiple Choice

Which statement best supports the claim that environmental factors played a major role in the development of schizophrenia in the Genain quadruplets?

A) All of the girls suffered physical abuse to varying degrees.
B) They all grew up in the same household.
C) They possessed the same allele for the condition.
D) They were monozygotic siblings.