Why Is Radio the Most Widely Available Medium of Mass

Multiple Choice

Why is radio the most widely available medium of mass communication around the world?

A) Compared to television, radio is highly portable and less expensive to produce, transmit, and receive.
B) Advertisers make most of their revenue using this medium.
C) The general public needs radio to learn of new musical artists.
D) Radio is the only type of media that can be safely utilized in an automobile.