A.   In support of the notion of a social "bridge," researchers find that dating someone whose friends drink encourages teens to begin drinking.

B.   In support of Stanley Milgram’s notion of conformity, the researchers find that dating someone who drinks encourages teens to begin drinking.

C.   In support of the notion of "the strength of weak ties," dating someone who drinks has no effect on whether teens begin drinking.

A.   They often rely on stereotypes and assumptions.

B.   They go against "common sense" understandings.

C.   All of these.

D.   They may be disproven with sociological research.