Maryse and Cerise Are Identical Twins Who Have Been Raised

Maryse and Cerise are identical twins who have been raised apart, in separate adoptive homes. Maryse has developed a psychological disorder, but Cerise does not appear to have the same disorder. What does this evidence suggest?

A) Environmental factors have more influence than genetic factors in this disorder.
B) Both genetic and environmental factors contribute equally to this disorder.
C) Neither genetic nor environmental factors contribute to this disorder.
D) Genetic factors have more influence than environmental factors in this disorder.