One of the Purposes of Darwin's Book,The Expression of the Emotions

Multiple Choice

One of the purposes of Darwin's book,The Expression of the Emotions in Man and Animals,was to show that

A) many human reactions with no obvious survival or utilitarian value today did have an adaptive purpose in the evolutionary past.
B) animals and humans have very different emotional responses.
C) human emotional expressions vary widely across different cultures.
D) many human reactions with a clear adaptive purpose today had no adaptive purpose in the past.