A 2, 500 square foot house in New Jersey costs exist1, 800 each winter to heat with its existing oil-burning furnace. For an investment of exist5,000, a natural gas furnace can be installed, and the winter heating bill is estimated to be exist1, 200. If the homeowner's MARR is 8% per year, what is the discounted payback period of this proposed investment? Choose the correct answer below. A. The discounted payback period of this proposed investment is 14 years. B. The discounted payback period of this proposed investment is 9 years. C. The discounted payback period of this proposed investment is 15 years. D. The discounted payback period of this proposed investment is 13 years