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D is corrent. The parol evidence rule prohibits the presentation as evidence of any prior or contemporaneous oral statements pertaining to a written agreement intended by the parties to be the final and complete expression of their contract. Two of the exceptions to this rule include the following: (1) to show invalidity of the contract due to a lack of contractual capacity or reality of consent, and (2) to show the existence or failure of a condition precedent.
A is incorrect. An exception to the parol evidence rule is that oral evidence can be used to show the existence or failure of a condition precedent.
B is incorrect. An exception to the parol evidence rule is that oral evidence can be used to show lack of contractual capacity.
C is incorrect. Under the parol evidence rule, it is only evidence of prior or contemporaneous agreements which modify the written contract that is prohibited. Any subsequent written or oral modifications may be presented as evidence.