First of all, you have to realize that this is a radio broadcast. You can't see anything. You can only hear it.
If you hear people screaming, don't you get the idea that the event is actually happening? The people listening for the first time in 1938 certainly thought it was real and it was happening<em> just now</em>.
There really isn't a good answered offered you given what I just wrote. A C and D are utter nonsense.
Answer: Out of a poor lot, you are left with B. It's all you can pick.
Explanation: A Extraneous detail is usually unrelated and off topic, not relevant in the text, like adding unneeded detail in a story or a report because it may be off topic or misleading
