Which of the Following Was a Major Reason for the Brain

Which of the following was a major reason for the brain drain that occurred after the fall of the Soviet empire?

A) The post-Soviet government declared that those who had worked in high posts under communism were not allowed to continue in those positions.
B) Western European states offered more professional opportunities for those with marketable skills.
C) The Russian government wanted to modernize and started insisting on the use of the English language, which many older Russians could not manage.
D) The migrants were mainly composed of those who had supported communism and fled out of fear of reprisals.