The Answer is : D.

 Choice (D) is correct. The baker’s duty to pay was conditioned upon the farmer’s first performing his obligations under the contract. The contract specifically provided that the baker promised to make payment thirty days after the farmer’s performance. The farmer’s performance, thus, was a condition precedent to such payment.

Choice (C) is incorrect. Conditions subsequent are rare, and when they arise, they extinguish an ongoing duty of performance that already exists. Under these facts, nothing that the baker did would impact the farmer’s obligation to perform. The farmer had to perform first, and there was no condition that would subsequently eliminate this duty. Only an anticipatory breach by the baker, prior to the farmer’s performance, would eliminate the farmer’s duty to perform.

Choice (A) is incorrect. The baker was obligated to pay only after the farmer’s performance. A condition precedent requires the occurrence of an event before one party can expect and/or demand performance by the other party.

Choice (B) is incorrect. Concurrently conditioned performance would require that the baker pay the farmer at the same time the farmer performs his obligations under the contract. While concurrent performance is the general rule (and default rule under UCC Article 2), the terms of the contract explicitly state that payment will take place thirty days after the farmer’s performance. Therefore, the performances are not concurrently conditioned.