The kids rooms were smelly because they hadn't been cleaned in weeks. A. The kids’ rooms were smelly because they hadn't been cleaned in weeks. B. The kid’s rooms were smelly because they hadn't been cleaned in weeks. C. The kid’s room’s were smelly because they hadn't been cleaned in weeks. D. The sentence is already correct.

Answer :

Answer:

B

Explanation:

Since there's both multiple kids and the word is posseive, the apostrophe comes after the word, hence kids'.