Question

For which of these reasons was it necessary to know the true source of "the war of the worlds"?

Answer 1

Not too sure on the question. The War to end all wars?   
Several reasons on why WWI started.  
Secret alliances.  
Unrestricted  submarine warfare.  
Nationalism.  
Militarism.  
War was seen as the answer.  
Applying Social Darwinism to humans.   
Minorities wanting more rights.  

OR Are you talking about the story.  
The story was read over the radio.  People freaked out and thought it was the truth.  A major panic.  Police operators were lost and overrun.