Correct answer choice is:
A. The revolution in Russia
Red scare was widespread fear, according to which it was thought that immigrants especially from Russia, southern Europe, and eastern Europe, might intend to overthrow the United States government.
The answer is income taxes
If I was an ordinary person in my 1930s and aged 40 with a middle income job such as an 'office assistant', I would not be in favour of helping other countries.
I would personally prefer a policy of isolation from the rest of the world. Primarily, this would be because I had seen with my very won eyes, the death and destruction bought on by World War I and more importantly the Great Depression.
With millions of job less people, poverty and people barely making ends meet, I would want our government to concentrate on the welfare of our own people, rather than go to war with countries thousands of miles away.