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. :)
If you pronounce a word correctly.
If you are in k12, the answer is:
"Ben looked forward to discovering which route they would take and which unique places they might visit this year."
Yes. He saw them has a subject (he), a verb (saw), and an object (them), so it is totally a sentence.
Perhaps D? It could depend on the context of the story though. I hope this helped, good luck! :)