Answer:
The correct answer is letter "D": finding the present value of a future sum of money.
Explanation:
The Discount Rate is the interest rate that you need to earn on a given amount of money today to eventually end up with a given amount of money in a certain period in the future. The concept is associated with the present value of money that estates having a dollar today will be worth more than having a dollar tomorrow.
In investing, typically the higher the interest rate, the higher the risk involved with the investment and its future cash flows.