Richard Klein Proposed That a Single Genetic Mutation Caused a Human

Richard Klein proposed that a single genetic mutation caused a human revolution in linguistic ability and material culture in

A) Neanderthals, which transformed them into modern humans.
B) anatomically modern humans, with no visible morphological change.
C) Neanderthals and modern humans simultaneously, allowing the two species to interbreed.
D) anatomically modern humans, with significant morphological change including the emergence of a chin.