Several of Your Classmates Are Volunteering at a Nursing Home

Several of your classmates are volunteering at a nursing home for extra credit, and they tell you how much fun they are having helping with the "parties" and the weekly activities for the residents. Although you had planned to do the article assignment for extra credit, you change your mind and decide to volunteer at the nursing home. Your new attitude was formed because of

A) direct contact.
B) an interaction with others.
C) chance conditioning.
D) group membership.