Recent Research on the Origins of Language Suggests That a Key

Recent research on the origins of language suggests that a key mutation might have something to do with it. Comparing chimp and human genomes, it appears that

A) a speech-friendly mutation occurred among Neandertals in Europe and spread to other human populations through gene flow.
B) chimps lack the tongue-rolling gene that all humans have, which might explain why they struggle to achieve clear speech.
C) the speech-friendly form of the gene FOXP2 took hold in humans some 150,000 years ago.
D) chimps share with humans all the genetic propensities for language but lack the language-activation mutation.
E) the speech mutation occurred even before the hominin line split from the rest of the hominids.