Better jobs & opportunities.
A push factor would be like famine or disease in the country, etc.
Through the use of naval power
Most of them were processed in Ellis island. They had to be processed there before they could enter the country.
The correct answer is C) She recruited her brother to pass secrets to the Soviets.
The statement that explains Ethel Rosenberg's role in the espionage case is "She recruited her brother to pass secrets to the Soviets."
Ethel and Julius Rosenberg proportionated valuable, secret, military information to the Soviet Union in the times of World War II. David Greenglass, Ethel's brother, was a machinist at the Los Alamos Laboratory in New Mexico. He and Rith, his wife, passed information to the Soviets about the United States Nuclear bomb project.