Kirima Moved to Germany with Her Parents and Little Brother

Multiple Choice

Kirima moved to Germany with her parents and little brother Leif when she was 13 and Leif was 4.Ten years later,both Kirima and Leif speak German and English,but Leif is more fluent with German than is Kirima and he has no accent in either language.This

A) shows that Chomsky's theory about a language acquisition device is wrong.
B) proves that males are better with foreign languages than females.
C) could have happened only if Leif's elementary education was better than Kirima's.
D) suggests that children have a sensitive period for language acquisition.