Answer:
d. compound interest
Step-by-step explanation:
Compound interest basically means that previously earned interests will earn interests on their own. For example, you invest $100 and receive a 5% yield. At the end of year 1 you will have $105. At the end of year 2 you will have $105 x 1.05 = $110.25. The $5 in interests previously earned during year 1 will earn $0.25 interest during year 2.