Final answer:
The correct statements about compound interest are that the amount of interest earned in any time period changes, interest is earned on the principal, and interest is earned on any accumulated interest.
Step-by-step explanation:
The correct statements about compound interest are:
- The amount of interest earned in any time period changes from one period to the next.
- Interest is earned on the principal.
- Interest is earned on any accumulated interest.
Therefore, the correct answer is option D) 1, 4.