A Buyer Agrees to Purchase "Two Cars" from an Elevator

A buyer agrees to purchase "two cars" from an elevator company.All material terms are contained in a written contract,but "two cars" is not further defined.Which of the following evidence can be admitted if there is a dispute over what "two cars" refers to?

A) Oral evidence that before the signing of the contract the parties intended the contract to be for the purchase of three cars.
B) Oral evidence that before the signing of the written agreement the elevator company said it would extend its normal 1-year warranty (which is stated in the written contract) to 2 years.
C) Oral evidence that the word "car" refers to an elevator,since that is normal in the elevator industry,and that it does not refer to any of the company's automobiles.
D) Written evidence from prior to the signing of the written contract that the parties intended the contract to be for the purchase of three cars.