Which of the Following Is a Possible Valid Defense by a Renter

Which of the following is a possible valid defense by a renter who is faced with a legal action for eviction for nonpayment of rent?​

A) breach of the implied warranty of habitability
B) refusal by landlord to waive fees for late payment of rent
C) refusal by landlord to negotiate in good faith for a lower, more reasonable rent
D) recent sale of the apartment to a new owner who has announced a plan to raise rents as soon as current leases expire