Which of the following is different from the others?

⇒ Option A is incorrect since 20 + (-25) = -5

⇒ Op[tion B is incorrect since (-37) –(-32) = -5

⇒ Option C is correct since (-5) × (-1) = 5

⇒ Option D is incorrect since (45) ÷ (-9) = -5

Option C is different from all other options. Since, after solving -5 × -1 we get a positive integer and for all other options after solving we get positive integer.