During the 1950s, television a. effectively spread images of working-class life to a growing number of americans. b. tried to replace newspapers as the most common source of information but failed. c. became the nation¿s least favorite form of leisure activity. d. became an effective advertising medium. e. presented shows that were controversial.

D. Became an effective advertising medium

Explanation:

The 1950's was the Golden Age of television,as such it became an effective advertising medium, as radio was during the 1920-1940 period. By becoming the center of social life in the American households the TV entered the life of people, allowing advertisemnt to evolve and become more efficient in its primary goal of positioning products.