What Effect Does Motivation Have on Helping Behaviours

What effect does motivation have on helping behaviours?

A) People who volunteered due to empathic concern and personal distress volunteered for altruistic reasons.
B) People who volunteered due to perspective taking volunteered for egoistic reasons.
C) People who volunteered for altruistic reasons helped for longer periods of time than those who volunteered for egoistic reasons.
D) People who volunteered for egoistic reasons helped for longer periods of time than those who volunteered for altruistic reasons.