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B is corrent. The parol evidence rule prohibits the presentation as evidence of any prior or contemporaneous oral statements for the purpose of modifying or changing a written agreement intended by the parties to be the final and complete expression of their contract. It would bar the admission of evidence which relates to a change in an unambiguous provision in the contract but would not bar the admission of evidence which clarifies an ambiguous provision.
A 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 agreements may be presented as evidence.
C is incorrect. The parol evidence rule does not bar the admission of evidence which is presented to establish fraud.
D is incorrect. The parol evidence rule does not bar from admission any evidence of an obvious error in drafting.