Which Provides the Strongest Evidence for the Biological Basis of Language

Multiple Choice

Which provides the strongest evidence for the biological basis of language?

A) The phonetic similarity between most languages
B) The fact that only human beings can acquire language
C) The consistent timing and order of language acquisition around the world, in spite of wide variations in the way adults interact with infants
D) The recent identification of a "linguistic gene sequence" on the eighteenth chromosomal pair