32. S sold his only horse to B for 10,000 cash. The parties agreed that S shall deliver the horse within one week from their agreement. Nothing is mentioned in the agreement on how S will take care of the horse before delivery.*

(A) S must take care of the horse with the diligence of a good father of a family before delivery.

(B) S need not take care of the horse because nothing was mentioned in the agreement on how the horse will be cared for.

(C) S must take care of the horse with extraordinary diligence.

(D) the absence of a stipulation on how the horse must be cared for renders the sale void because such stipulation is an essential element of the contract.

Brief explanation will help, thanks!