Answer:A) 8 years
Explanation: For every business, the shorter the payback period, the more attractive the investments and the longer the payback period the less attractive such investment is.
Payback period is the time in which the initial cost of an investment is able to be recouped through inflow of cash generated by such investment.
It is calculated as cost of the initial investment divided by the annual cash flow. ie
Cash Payback Period= Initial Investment/ Annual Cash flow
= 16,000/ 2000
= 8 years