oe buys a 4-year old car from Mary, and gives Mary a written note that "acknowledges his debt in the amount of $5,000, payable to Mary." Is there a contract between Joe and Mary, and is this a negotiable instrument?
A. There is a contract and a negotiable instrument.
B. There is neither a contract nor a negotiable instrument.
C. It is a negotiable instrument, but not a contract.
D. It is a contract, but not a negotiable instrument.