Answer:
You could say: sometimes the person lecturing repeats the same thing too many time without realizing it, it's tiresome for both you and the person lecturing, and lectures can be long.
ik this is a short answer, but I hope any of this helps.
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
