Consider the following situations:

I. Buyer wants to introduce evidence that his acceptance to a contract for the sale of Seller's home was entered into under duress.

II. Retailer wants to introduce evidence that Manufacturer's "acknowledgement of purchase order" was not in response to an actual purchase order and the parties never contracted.

III. Buyer of a Blu-ray player wants to introduce evidence that the written contract was supposed to include a stereo system that the parties agreed to orally when nothing about the stereo was included in the writing.

IV. Seller wants to introduce evidence that her contract with Buyer, which was reduced to writing, was modified to adjust the date of performance.

In which of the above situations would the parol evidence not apply to preclude the proffered evidence if the court determines that the relevant contract was completely integrated?

(A) I and II only.

(B) I, II, and IV only.

(C) III and IV only.

(D) I, II, III, and IV.