The answer is B, Julius and Ethel Rosenberg were executed for giving nuclear weapons secrets to the Soviet Union. They were American citizens who were executed for conspiracy to commit espionage for passing information relation to the atomic bomb to the Soviet Union. The other spies who were caught along with them were not executed. In 1995, the United States government released a series of decoded Soviet cables, code-named VENONA, which confirmed that Julius acted as a courier and recruiter for the Soviets, but did not provide definitive evidence for Ethel's involvement.Ethel's brother David Greenglass, whose testimony had condemned her, later stated that he had lied to protect his own wife Ruth, who had been the actual typist of the classified documents he stole, and that he was encouraged by the prosecution to do so
