USA Oil Corporation Signs an Instrument That States It Is

Multiple Choice

USA Oil Corporation signs an instrument that states it is being exe?cuted "as per contract for a purchase of 4,000 barrels of oil dated May 1." This instrument is

A) negotiable.
B) nonnegotiable,because information about the sale must be ob?tained from another source.
C) nonnegotiable,because it states an express condition to payment.
D) nonnegotiable,because the terms of the contract are not clear on the face of the instrument.