What Explanation Does Research Give for the Finding That Volunteers

Multiple Choice

What explanation does research give for the finding that volunteers with egoistic motives tend to remain active volunteers longer than those with more altruistic motives?

A) Altruistic motives do not stand up against the personal costs of helping for long.
B) Altruistic motives are not genuinely felt.
C) Altruistic motives create more personal cost for the volunteer.
D) Altruistic motives help one manage the personal costs of helping.