Whichbusiness took on a whole new importance in the American economy in the 1920s?

A) litigation
B) railroads
C) advertising
D) specialty crops

During the 1920s, advertising took on a new level of importance in the American economy. This era, often referred to as the "Roaring Twenties," saw a significant boom in consumer culture, with mass-produced goods becoming widely available. Advertising played a crucial role in promoting these products to the burgeoning consumer market, utilizing new techniques and media to influence purchasing decisions.