Why did the FBI most likely believe Ethel Rosenberg was guilty?
A Her sons provided proof that she had passed along military and industrial secrets.
B Her husband had already been arrested, but he would not talk about Ethel.
C Her sister said she was the female leader of the Communist party.
D Her brother, David Greenglass, said she had typed up information to be passed on to the Soviets.
The correct answer is D: Her brother, David Greenglass, said she had typed up information to be passed on to the Soviets.
Explanation: David Greenglass, Ethel Rosenberg’s brother, testified against her during the trial, stating that she had helped him by typing up documents that contained information meant for the Soviet Union. This testimony was crucial in convincing the FBI and the court of Ethel’s involvement in espionage activities. If you have more questions about this topic or need further assistance, feel free to ask!