Answer:
A. How communism had infiltrated the government after WWII
Step-by-step explanation:
Joseph McCarthy, the then United States Senator's fears appeared to be directed at "How communism had infiltrated the government after WWII"
This is evident when in 1953, he declared that "Any man who has been named by either a senator or a committee or a congressman as dangerous to the welfare of this nation, his name should be submitted to the various intelligence units, and they should conduct a complete check upon him. It’s not too much to ask."