The answer is D. How I figure out questions like these is by eliminating the choices that I know aren't right.
Like on A, I knew it wasn't right because the passage didn't say anything about invitations to dinner parties.
I knew B wasn't write either, because the passage doesn't talk about different types of people that come to a dinner party.
Not C, because it doesn't give advice on serving healthy entrees.
But it is D, because it tells you the do's and don'ts on how things should and shouldn't be done at a dinner party.