Statistics expert Daniel Yankelovich believes that _____ give Americans a certain amount of self-esteem, a fairly clear idea of who they are.

A) middle-class values
B) terminal values
C) egocentric values
D) affiliation needs

Middle-class values, such as hard work, education, and material success, are often embraced by Americans and provide them with a sense of identity and self-esteem. Terminal values and egocentric values are not specifically linked to Americans' sense of identity, and affiliation needs may contribute to social connections, but not necessarily a sense of self-identity.