The CB Radio Was Very Popular in the 1970s and 1980s

Multiple Choice

The CB radio was very popular in the 1970s and 1980s for communicating while driving. People bought them because other drivers had them too and they could therefore talk with many others on their trips. This illustrates

A) that the demand curve for CB radios was inelastic.
B) the network effect.
C) that CB radios and gasoline are complementary goods.
D) the effects of mobile phones on the demand curve for CB radios.