An uncomfortable feeling produced by holding two contradictory attitudes, or by acknowledging an attitude that conflicts with a behavior, is called __________.

_________, or the spontaneous speech people use as they engage in joint activities, is the main function of language, far outweighing all other forms of discourse.

Fill in the blank(s) with the appropriate word(s).

In what year was the first personal computer (PC) introduced?

A) 1968 B) 1974 C) 1980 D) 1988