You can say that you watched tv, did sport, learn for school, clean you room,...
You can imagine something. Think of what you can posibly doing at home.
I'd say D because I think I remember that being a big part of citing works. A could be correct too. I'd look up maybe basic MLA rules and see which ones comes up first. It kinda depends on what your teach emphasizes. Though I'm pretty confident it isn't B or C
