The popularization of radios expanded the communications and sports industries, as stated in option A and further explained below.
Before the television, the computer, or the smartphone, radios were the most important means of communication. As they become more and more popular, families would gather around their radios at home to enjoy the programs together.
That popularization impacted the communications and sports industries. Different types of programs were created in order to inform and entertain listeners. Sports programs would also keep people updated concerning their favorite teams and games.
With the information above in mind, we can choose option A as the correct answer.
The complete question with the missing answer choices is the following:
The popularization of ________ expanded the communications and sports industries.
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