The correct answer is C. Mc Carthy claimed that there were communists in the US military.
Step-by-step explanation
Senator Joseph McCarthy was a US Republican senator, who was noted for investigations about alleged Soviet and Communist infiltrations in the United States Army and some figures in the public administration. Due to his insistent effort to investigate and point out the armed forces, infiltrations and sympathizers of the Soviet Union, he ended up affecting the image of President David Eisenhower, for which he ended up being the victim of a censure motion in 1954. So, the correct answer is C. Mc Carthy claimed that there were communists in the US military.