Which of the Following Is NOT a Reason for Increasing

Which of the following is NOT a reason for increasing income inequality?

A) A shift to "superstar" markets, in which firms with larger markets seek the very best talent to work for their companies.
B) Rapid technological improvements, which favor educated workers more than lower-skilled workers.
C) Growth of foreign trade, which helps higher-skilled workers whose talents are in higher demand worldwide.
D) A decline in the dollar value of the minimum wage over several decades.