Charles Darwin First Proposed That Emotions Are Part of Human

Charles Darwin first proposed that emotions are part of human evolutionary heritage based on his observation that:

A) emotions feel instinctive and automatic, rather than rational.
B) emotional responses among people he encountered seemed to produce functional, desirable consequences.
C) the expressions of non-human animals, small children, and human adults are similar in many emotional situations.
D) emotions were considered by western philosophers to be more characteristic of animals than of humans.