Failure by a promissory notes' maker to pay the amount due at maturity is known as:

A) Protesting a note.
B) Closing a note.
C) Dishonoring a note.
D) Discounting a note.
E) Depreciating a note.

Dishonoring a note means the maker of the promissory note has failed to pay the amount due at maturity. Protesting a note refers to the process of formally notifying all parties involved in a promissory note that it has been dishonored. Closing a note, discounting a note, and depreciating a note are not relevant to this situation.