Encircle the odd one of the following question

⇒ Option B is odd one

⇒ (-1) × (-1) × (-1) = -1

[since, minus × minus is plus and plus × minus is minus]

⇒ Option A is not odd

⇒ (-1) × (-1) = 1

Option C is not odd

⇒ (-1) × (-1) × (-1) × (-1) = 1

Option D is not odd

⇒ (-1) × (-1) × (-1) × (-1) × (-1) = 1

∴ option B is odd one as we get negative integer after their product. Where, in every option we get positive integer after their product.