That is she. is the answer
The compound verb is earned good grades.
The revision that maintains the best academic style throughout (and is most polite) would be answer D. The "academic style" is generally meant to be free of slang and grammatically correct.
Hope this helps. <span />
After
watching her TED video you can conclude that the particular word she
likes is contagious. I believe that she likes this particular word
because the meaning varies depending of the context in which you use
it. For example in the video she goes to say that many things are
contagious like laughter, passion, and inspiration.
I
hope it helps, Regards.
