The answer is a. selecting the right medium.
Here is the answer: At the very start of the radio drama, Orson Welles had repeatedly said that the said drama is a science fiction. The sci-fi radio drama was said to cause mass panic because of its realistic script. Orson Welles also believed there might have been a small percentage of the population that was panicking. It was also stated in New York Times, that people were in a mass panic because of the drama itself. However, C.E Hopper had proven that no such thing had happened.
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In the 20,000 leagues under the sea, they had made the important decision on escaping the Nautilus which leads to the climax and main part of the story. Which is the building action leading to major changes around them causing drastic decisions needing to be made, which then leads to falling action, causing them having to rethink decisions and create different resolutions.
The answer to your question is B.