The U. S. group with the highest median income are

a. white women

b. Asian men

c. black women

d. white men

There is a gender pay gap in the US in that men typically earn more than women, and this includes for the same jobs and in the same position.

There is also a skin-colour discrimination in that people of color typically earn less than white people. So the people with the biggest income would most typically be white men!