A Material Incentive for Joining an Interest Group Is Best

A material incentive for joining an interest group is best described as

A) pleasure in associating with like-minded individuals.
B) satisfaction resulting from working for a cause in which one believes.
C) a practical benefit such as discounts, subscriptions, or group insurance.
D) the ability to enjoy the outcome of a group's efforts without having to contribute.
E) the opportunity to compete for public office.