My mom was optimistic that the camping trip would go well, but my dad was doubtful that we would have nice weather and enough supplies.

Optimistic means hopeful or expecting that things will go well. The sentence says the mom expected the camping trip to go well, so “hopeful” is the best match. “Uncertain” means not sure, while “unprepared” and “grateful” have different meanings.

AI-written and checked against the verified answer.