The cause and effect relationship suggested in this paragraph is the rise and popularity of radio caused a new approach to advertising. Thus the correct answer is B.
What is advertising?
Advertising is a tool of communication to create awareness about goods and services and promotes them in the market. This is referred to as the cheapest and quickest way of promotion.
The given passage it reflects that radio become popular due to widespread use in listening to music , concerts, and event-related news. This shows that it has a wide reach to the audience.
Therefore, optyion B's popularity of radio caused a new approach to advertising is appropriate to answer.
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