In Investigating the Origins of Human Language from an Evolutionary

In investigating the origins of human language from an evolutionary perspective Corballis (1999, 2004) argued that:

A) superfluous hand signals are a sign of restricted intelligence.
B) hand gestures are the likely precursor to spoken language.
C) sign language among the deaf is not really language at all.
D) chimpanzees talk better with their hands than their mouths.