Which of the Following Is a Reason That Barriers to Migration

Which of the following is a reason that barriers to migration suit the needs of trans-national companies?

A) It ensures cheap labour as workers cannot move to where higher wages are offered
B) Trans-nationals work to eliminate social injustice by enabling and supporting local people to gain work
C) Trans-national companies are rarely global,but usually based on one country
D) In Australia most trans-nationals enjoy the benefit of a highly skilled local workforce