Answer:
Option: They adopted mass production manufacturing techniques developed by Henry Ford.
Step-by-step explanation:
Many manufacturers in the 1920s improve efficiency to meet consumer demands by adopting the mass production technique. During the 1920s, it was the first time when Americans people introduced to new appliances. The requirements for new gadgets, automobiles, the washing machine, the radio, instant camera, jukebox, television, and refrigerator increased. Many of the manufacturers adopted the assembly lines for production. The assembly lines helped in producing the finished product in a short period.