What finally ended Senator McCarthy’s crusade? Other senators accused him of holding communist ideas.
Other senators decided his accusations were wrong and unfair.
People who lost their jobs because of McCarthy took him to court.
Private organizations began to carry out anticommunist investigations.

Option: Other senators decided his accusations were wrong and unfair.

Explanation:

Senator Joseph McCarthy began the period of McCarthyism in America during the 1940s and 1950s. Under McCarthyism is, many arrested by accusing people as Communist spies without proper evidence. The fear of the Soviet Union and communism led to hundreds of Americans sent into prisons while thousands lost their jobs. The primary targets of suspicions were government employees. His crusade ended when he attacked several U.S. Army officers having communist sentiments. Many other senators accused him of using power in the wrong way and considered him as a thoughtless and tyrant who never produced a proper document.