Madolyn's Father Executes a Promissory Note Stating,"I Promise to Pay

Madolyn's father executes a promissory note stating,"I promise to pay to the order of my daughter,Madolyn,$50,000,on the date that she marries Robbie Roberts." Is the note negotiable?

A) Yes
B) No,because the date of the marriage is uncertain.
C) No,because the act of marriage is uncertain.
D) No,because neither the date nor the act are certain.