The Following Language Appears in a Mortgage: "In the Event

The following language appears in a mortgage: "In the event the buyer sells, transfers or assigns the property described herein as security for the above-referenced underlying note, the full balance of the loan then due and owing, including principal, shall become due." The language is an example of:

A) An acceleration clause.
B) A balloon payment clause.
C) A due-on-sale clause.
D) An Anaconda clause.