Which of the Following Is Considered to Be the Most

Multiple Choice

Which of the following is considered to be the most likely order of steps along the road to the evolution of full-fledged human language?

A) from blended calls through closed calls to duality of patterning
B) from duality of patterning through blended calls to closed calls
C) from closed calls through duality of patterning to blended calls
D) from closed calls through blended calls to duality of patterning