The use of fear in suppressing political viewpoint, and in specific by accusing communist people will be the best definition of McCarthyism.
Option B
Explanation:
McCarthyism is the method without proper consideration of evidence in accusations of subversion or treason.
Senator Joseph McCarthy was the name of the term, which schedules Between the late 1940s and the 1950s and it was recognized in the United States as the Second Red Scare (RS).
It was defined by increased political oppression and a campaign that propagated the fear of communism and spying by Russian agents on American institutions.
During the mid-1950s, McCarthyism began to fall, largely because America's public success and opposition gradually declined.