What is the purpose of incorporating evidence in your writing?

What effect is achieved by the use of the phrase "as the devil would have it" in the second sentence?

Which of the narrator's statements in "the yellow wallpaper" suggests that she does not think women are too frail to be intellectual? a.i verily believe she thinks it is the writing which made me sick! b.of course i didn't do a thing. jennie sees to everything now. c. i don't feel as if it was worth while to turn my hand over for anything, and i'm getting dreadfully fretful and querulous. d. so i walk a little in the garden or down that lovely lane, sit on the porch under the roses, and lie down up here a good deal.

Apolitical campaign showing the candidate wearing a hard hat and work shirt while touring a factory is using oa) glittering generalities. ob) transfer appeal. oc) testimonial. od) plain folks appeal.