Why have John and his wife come to stay in

the ancestral halls for the summer?

They inherited the home and decided to take a vacation.

He is a doctor, and they are there for his job.

She suffers from a nervous illness and needs rest.

She has always dreamed of a get-away like this one.

The third option: She suffers from a nervous illness and needs rest.

Explanation:

This is from the Yellow Wallpaper by Charlotte Gilmore.

The narrator and her husband John went to stay in the ancestral halls so that she could get better from her illness. Proof of this can be seen in the following lines from the story:

'He said we came here solely on my account, that I was to have perfect rest and all the air I could get. "Your exercise depends on your strength, my dear," said he, "and your food somewhat on your appetite; but air you can absorb all the time." So we took the nursery at the top of the house.'