Joseph McCarthy: a. had the full support of the Senate during his anticommunist crusade.
b. was an embarrassment to his party by 1954.
c. successfully uncovered the communist infiltration of the federal government.
d. successfully uncovered the communist infiltration of the U. S. army.
e. was hailed as an American hero for his fight against communism

B. was an embarrassment to his party by 1954.

Explanation:

In 1950s, Untied States experienced the 'Red Scare' . red Scare Is  a fear of communist infiltration to United States. At that time, many people believed that soviet Union has sent its agent all across the world in order to spread communistic ideology into United States.

Joseph McCarthy publicly accused a lot of people to be a Soviet Union's spy during this time period.  But the vast majority of his accusations were made without any proof. But despite not having any proof, McCarthy keep continue his accusations toward his political opponents.

This made John McCarthy and the party that he represented look childish and  foolish,

i believe it to be a democracy