7. The post-World War II Red Scare began in 1945, when a clerk in the Soviet Embassy in Ottawa, Canada, defected and
a, turned over documents proving that Soviets were trying to infiltrate the U. S. government.
b. started Project Venona in an attempt to crack the Soviet spy code.
c, urged the US government to establish a loyalty review program and pass the McCarran
Act,
d, testified before the U. S. Congress that there were Communists in Hollywood.

Correct answer is A. turned over documents proving that Soviets were trying to infiltrate the U.S. government.

Explanation:

Option A is correct because this event created a massive retaliation in the United States, where many people were marked as Communists, sometimes even without evidences.

Venona project was started during WW2 with a goal to decrypt messages that were sent by Soviet intelligence agencies.

McCarran  Act was introduced in 1950, with a goal to act against Communism in US.

D is also not correct as many in Hollywood were marked as Communist and there were testimonies against them even on courts.

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."