14. Why did radios become a big business by 19292 € O A The economy was recovering, and people had more money to spend on luxuries such as radios.
OB. The development of synthetic fibers like Bakelite plastic facilitated widespread radio production.
O C. As more people purchased Ford's automobiles, they started needing entertainment for their road trips.
OD. Radios that had been used for wireless communication during the war were sold to consumers and gained popularity.