The answer is:
A.
Each kilometer has 1000 meters and each meter has 100 centimeters
So there is 100,000 centimeters in a km because 100 x 1000 is 100,000
0.25 km has 25,000 centimeters because 100,000 x 0.25 is 25,000
0.25km = 250m = 25000cm
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