Answer :
Televised hearings that put his bullying tactics on display for the entire country.
McCarthyism was the practice of publicly accusing someone of being related to the communist, putting McCarthy's bullying tactics on display was the last straw in Americans' eyes.
What is McCarthyism?
It was the practice of publicly accusing someone of traitors, disloyalty, or being a spy of communists without any sufficient proof or evidence. the use of unfair means during the investigation to suppress the opposition.
It started after WWII, with the perception of national or foreign communist intrusion into the federal system of the U.S. the last straw for McCarthy in the eyes of the American public was televised on putting his bullying tactics on display for the entire nation.
Therefore, option b appropriately describes the last straw for McCarthy in the eyes of the American public.
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