Which of the choices would provide an ending most consistent with the essay as a whole?

A. NO CHANGE
B. I assured her that the cheapest possible option would more than suffice, and when she told me it was only $15 per month, I arranged to have it installed.
C. I arranged to have installed the cheapest possible option that would more than suffice, which she told me was only $15 per month.
D. She told me it was only $15 per month, which I assured her would more than suffice as the cheapest possible option, so I arranged to have it installed.