Someone Who Joins an Interest Group Because He or She

Someone who joins an interest group because he or she believes in the ideals of the group and wants a sense of belonging and community with others who share their beliefs is acting for

A) solidary incentives, but not purposive incentives.
B) material incentives, but not solidary incentives.
C) both material and solidary incentives, but not purposive incentives.
D) both purposive and material incentives, but not solidary incentives.
E) both purposive and solidary incentives, but not material incentives.