On March $15,$ in a signed written contract, a manufacturer agreed to sell $40,000$ pens at $$1$ each to a retailer, delivery to be made in two equal installments on April $1$ and May $1.$ The contract was silent as to the time of payment, but on March $25$ the two parties orally agreed that the entire purchase price was to be paid on delivery of the second installment. On April $1,$ the manufacturer delivered $20,000$ pens, and the retailer accepted them. The manufacturer then demanded payment of $$20,000.$ When the retailer refused to make the payment, the manufacturer sued the retailer for breach of contract. In its defense, the retailer proffered evidence of the March $25$ oral agreement.$$

Is the manufacturer likely to succeed in its action?$$

Group of answer choices

No$,$ because the March $25$ oral agreement was an effective modification of the written contract.

Yes, because the parol evidence rule bars the introduction of evidence of an oral agreement modifying a written contract.

No$,$ because even though the March $25$ oral agreement is not effective, payment is due at the time of the second installment.

Yes, because there was no consideration to support the modification.