Answer:
Married people who have children.
Explanation:
The category of the U.S. population in which women do most of the housework is married people who have children. This has been true for thousands of years because women are the caretakers and men mostly go to work. This should stop because women are equal to men and they should both be able to have a job.
They would need to schedule an appointment for the the kidney and heart doctors because of his body function. But it could be because his parents isn't there.
The answer is D because answers A, B, and C are simply spreading American culture throughout America, thats not cultural diffusion by any means.