Answer:
Correct answer is C. New Mexico and Utah
Step-by-step explanation:
C is the correct answer because California was admitted as a free state, and Utah and New Mexico could decided on their own whether they want to allow slavery or not. Of course that is why option B is not correct.
A is not correct as this two states settled that question in the famous Kansas - Nebraska Act from 1854.
D is not correct as it permitted slavery in Washington.