Which of the Following Statements Is Accurate

Which of the following statements is accurate?

A) Darwin suggested that expressions originating as functional behaviors can become communication signals that remain adaptive even if the original function disappears
B) Darwin disagreed with contemporary theorists who thought emotion expressions were a good example of natural selection
C) Darwin thought that facial expressions originating as serviceable habits were entirely separate from facial expressions that have communicative functions
D) Darwin concluded that very little evolutionary continuity exists between facial expressions in humans and facial expressions in other animals