Answer:
When faced with a question like this what you should do is read your answer for part A and then read the quote you chose for part B and see if the two add up to make a valid reasoning to support each other.
Answer:
B
Explanation:
McCarthyism is the practice of making accusations of subversion or treason, especially when related to communism. The term refers to U.S. senator Joseph McCarthy (R-Wisconsin) and has its origins in the period in the United States known as the Second Red Scare, lasting from the late 1940s through the 1950s.
The idea that O'Sullivan describes in this quotation is A) manifest destiny. Manifest Destiny was an idea that O'Sullivan was responsible for popularizing in the 1800s. This political theory or ideology sought for the United States to expand its borders to the Pacific Coast based upon a god given right to expansion which he called Manifest Destiny.