The Brain Drain Refers To

The brain drain refers to:

A) the lack of adequate education in countries that lack human capital.
B) the phenomenon where a country's most educated people immigrate to other countries where their talents are more highly rewarded.
C) the immigration of educated people to other countries where their talents are not used, such as foreign engineers driving taxis in New York.
D) the loss of intellect because of unskilled, repetitive jobs.