In Comparing Positive with Negative Emotions, All of the Following

In comparing positive with negative emotions, all of the following have been discovered

A) Negative emotions are associated with only one brain region while several regions can trigger positive emotions.
B) Negative emotions involve more physiological arousal than positive ones.
C) Negative emotions outnumber positive ones.
D) Negative emotions have unique facial expressions associated with them whereas many positive emotions use some variation on the Duchenne smile.