What is the "brain drain" concept all about?

Multiple Choice

A) During the 1940's, 1950's and 1960's, the U.S. State Department pursued a policy of finding and attracting large numbers of well-educated, talented and productive immigrants who were willing to work. They also had to sign an agreement not become dependent on government welfare. This type of 'brain drain' strategy that was practiced during that era benefited the U.S. economy.

B) This happens when educated and law-abiding people are enticed to leave their home country to move to another country that is trying to attract talented individuals.

C) Albert Einstein and Warner Von Braun were two top-tier German scientists that escaped Hitler's Nazi Germanyduring World War II with the help of U.S. OSS secret agents. They both contributed to America's scientificadvances in physics and space travel. This is a good example of a successful brain drain story that benefited theUnited States.

D) All of the statements above are true.