Answer:
People felt that if communism started to take over, they'd never be able to have their rights back.
Explanation:
James Garfield was the Rosecrans's chief of staff who later became a president of the United States. James A. Garfield served as chief of staff under Major General William S. Rosecrans, the commander of the Army of the Cumberland. Garfield resigned in<span> December 1863 from the Army to take his seat in the U.S. House of Representatives.</span>
Another way your question could be framed is “why do nations use imperialism on weaker countries?” and the simple answer is there are several motives such as ethnocentric purposes, religion, access to natural resources, expanding power, etc. Specifically people resort to imperialism on weaker countries because they are vulnerable to accept whatever helps the people survive in times of unrest.
I believe it would be the answer B. Granting copyrights and patents. Seems logical.