In the 1920s,the development of practical radio communication was furthered by
A)the theory of modulation.
B)the use of vacuum tubes.
C)enthusiasts who built their own sets at home.
D)both the theory of modulation and the use of vacuum tubes.
E)All these answers are correct.

Question

Quizplus · Accepted Answer

The development of practical radio communication in the 1920s was advanced by the theory of modulation, the use of vacuum tubes, and enthusiasts building their own sets, making all the options correct.

In the 1920s,the Development of Practical Radio Communication Was Furthered