Answer:
A. need payoff
Explanation:
Based on the information provided within the question it seems that the salesperson's SPIN technique is an example of a need payoff. This term refers to asking an individual/customer about the value or importance that something can provide them. Which is exactly what the salesperson is stating by asking "how much money (value) can this save you?"
Basically paper money and I believe coin's rather than other forms of payment.