The answer to this question should be: C. Kilometers
To answer this question, I will rearrange the option from the smallest unit into the highest unit.
Centimeter
Inch
Yards
Kilometer
Centimeter and inch are similar, they are mostly used for measure height of people or object. Yards is used for measuring a field area. Kilometer would be the biggest. It used for roads or expressing distance between city/country. So the answer should be kilometers