To find the time when the number of laps is 9, we can take the given line of best fit, and extend it until we cover the point where the number of laps is 9.
The extension of the line of best fit is shown in red in the following diagram:
This extension does not need to be exact but we do need to follow the path of the original line.
Now, we find the point where the number of laps is 9. That point is shown in blue in the following diagram:
And from there, find the corresponding number in the vertical axis (the time axis):
As we can see, the closest number of minutes is 5 minutes.
Answer: B. 5 minutes
