Which of the following accurately represents a fundamental idea within the “interest-group theory” developed by David Truman and Earl Latham?

a. people tend to think of themselves as members of groups, and each person belongs to many different interest groups

b. people are members of groups, but each person belongs to only one interest group

c. there are only a few interest groups in society, and this small number of groups try to receive special treatment from government

d. there are many people who are not interested in belonging to groups, and those who are interested in groups can learn about city jobs faster.