A
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Marni runs 1500 meters around the school track. What does she need to know in order to find out her speed?

### Choices:
A. her time from start to finish
B. the number of steps she took
C. her heart rate at the finish line
D. the direction she began running

### Answer:
