The correct answer is: simple interest.

Let me know if you want details or have any questions!

Here are some related questions you might find useful:

1. What is the formula for calculating simple interest?
2. How does compound interest differ from simple interest?
3. Can simple interest be negative in any case?
4. How does time duration affect simple interest growth?
5. What are real-world examples of simple interest usage?

Tip: To distinguish between simple and compound interest, remember that simple interest grows linearly, while compound interest grows exponentially!