According to a Social Functional Perspective, Why Does the Expression

According to a social functional perspective, why does the expression of sadness exist?

A) It causes the person experiencing sadness to isolate themselves from the group so that they can recover from their loss in isolation
B) It pulls group members to the expresser and compels them to provide support and care
C) It helps the body rest and recuperate from trauma by activating the peripheral nervous system
D) It signals a transition from one goal state to another and triggers a transition to attempting to recover the lost object or person