In which one of the following examples is the instrument negotiable?

A) A draft that says: "Pay to the order of Sue Smith once she repairs my computer"

B) An instrument that says only: "This confirms my $1000 debt to Sue Smith"

C) A note that says: "Payment is conditional upon the terms of the mortgage between the parties dated June 1,2000"

D) A note that says: "This note is secured by the property described in the parties' mortgage of June 1,2000