please help!

Dennis negotiates with John to purchase real property and signs a written agreement that does not contain a merger clause but otherwise encompasses the final and complete expression of their agreement. After purchasing the property, Dennis discovers problems with the property's plumbing and sues John for breach of contract. Dennis attempts to introduce evidence of a conversation with John that occurred prior to their signing of the agreement in which John allegedly assured Dennis of the impeccable condition of the plumbing. May Dennis introduce such evidence? No, the parol evidence rule prohibits introduction of prior oral agreement when the written agreement is a final expression of the parties' agreement No, the statute of frauds requires the contract to be in writing and therefore no evidence of prior oral agreements may be introduced. Yes, parol evidence may be introduced to prove elements of the agreement not reduced to writing. Yes, the parol evidence rule allows for introduction of oral evidence to illustrate prior assurances because the agreement contains no merger clause