Answer: Option A
Explanation: Payback period is the time period it takes for an investment to cover its initial investment in the form of future cash flows. It is computed as follows :-
![payback\:period=(Initial\:investment)/(Periodic\:cash\:flows)](https://img.qammunity.org/2020/formulas/business/high-school/vw2hynhzy3ja61spwk37hag0j8dq1lblua.png)
If we discount back the cash flows, it will result in lowering its value. As the denominator in a equation decreases the value of result increaes.
Hence, option A is correct.