It's got to be C because none of the others relate to collaboration, but I'd say if you were unsure about this answer then the only other sensible one could be B, but I'd go with C.
Answer:
I think that the answer is 1. Travel
Regret,
unhappiness,
sadness,
ruefulness,
grief,
sorrow,
gloominess,
mournfulness,
lugubriousness,
sorrowfulness,
rue,
ruthfulness.
Antonyms: happiness.
It should be A because if you aren’t evaluating the text based on your opinion it’s main focal point should be the writing itself and how it was put together