Final answer:
Tammy ran 8 kilometers. The closest measurement in miles is 5 miles (option A).
Step-by-step explanation:
To convert from kilometers to miles, you can use the conversion factor of 1 mile = 1.6 kilometers. Since Tammy ran 8 kilometers, we can find the closest measurement in miles by dividing 8 by 1.6.
To do the division, we have 8/1.6 = 5.
Therefore, the measurement closest to the number of miles Tammy ran is 5 miles (option A).