The correct answer is A. I am sure. Hope it helps:)
The answer is tragically.
Because in a summary you should use as <em>few</em> details as possible, and saying tragically horrible is too many details for one sentence.
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)
<span>Restrictive clauses limit the possible meaning of a preceding subject. :)</span>
