Imagine That Twins Are Separated at Birth

Multiple Choice

Imagine that twins are separated at birth.One is raised speaking only English,whereas the other is raised in a bilingual household and speaks both English and Spanish.Years later,the twins meet and decide to learn French together.The bilingual twin has a remarkably easy time learning French,whereas the other twin struggles.This difference may be explained by

A) codominance.
B) incomplete dominance.
C) multiple-allele inheritance.
D) multifactorial inheritance.
E) polygenic inheritance.