The So-Called "Facial Feedback Hypothesis" Refers to the Idea That

The so-called "facial feedback hypothesis" refers to the idea that

A) facial expressions seem to have evolved in order for humans to better communicate feelings to one another.
B) we get information about what other people are feeling via their facial expressions.
C) others' emotional facial expressions can actually evoke or heighten our own emotional experiences.
D) feedback from our own facial muscles can actually evoke or heighten our own emotional experiences.