Who Among the Following Would Probably Have the Highest Income

Multiple Choice

Who among the following would probably have the highest income?

A) a couple in which both partners have high school educations and work at Walmart
B) a husband who has a high school degree and a middle-management job and his wife who is a stay-at-home mother
C) a couple in which both partners have high school educations; he is a primary school teacher and she is a waitress
D) a husband who has a college degree and is a high school teacher and his wife who has an MBA and works as an insurance company executive
E) a couple in which both partners have college degrees and are pursuing higher studies