6798. The oppressive weather made the work difficult for them.

✅ The correct answer is option C.
Turbulent : characterized by conflict, disorder, or confusion; not stable or calm.

Disappointing : failing to fulfil someone’s hopes or expectations.

Unbearable : not able to be endured or tolerated.

Cold : of or at a low or relatively low temperature, especially when compared with the human body.

Oppressive : weighing heavily on the mind or spirits.

Synonym of Oppressive is Unbearable