An Ordinary Annuity Is Best Defined by Which One of the Following

An ordinary annuity is best defined by which one of the following?

A) increasing payments paid for a definitive period of time
B) increasing payments paid forever
C) equal payments paid at regular intervals over a stated time period
D) equal payments paid at regular intervals of time on an ongoing basis
E) unequal payments that occur at set intervals for a limited period of time