Why Can We Not Use the Languages of Nonliterate Societies

Multiple Choice

Why can we not use the languages of nonliterate societies to learn about the origins of language?

A) Their languages are not simpler or less developed than our own.
B) Their written histories do not go far enough back in time.
C) They were often developed more recently than written languages.
D) Languages of nonliterate societies change too quickly to be any use for study.