Answer:
C
Explanation:
As much as we want to, we cant underestimate potetnial life on other planets. So this all deals with communication. If there is life in other galaxies, it will take years to get responses, and even the wavelengths will be absorbed.
I'm sure the answer is William James.
The word or phrase to fill into the gap is the "Ku Klux Klan", an extreme right organization calling for what they would call a "purification" of the US-American society.