Which unit would probably be most appropriate for measuring the distance between two towns?

• A. Centimeters
• B. Millimeters
• C. Meters
• D. Kilometers

Answer: (D)

When measuring a distance like the space between two towns, you want a unit that handles large lengths without turning into a long string of digits. Centimeters and millimeters are for small measurements, so they'd force you to write huge numbers (for example, 60 kilometers is 60,000 meters or 6,000,000 centimeters). Meters could work, but distances between towns are typically tens or hundreds of kilometers, which would still be awkward to express as meters. Kilometers keep the numbers simple and are the standard on maps and road signs, since 1 kilometer equals 1000 meters. So a distance of 60 kilometers is much clearer and more practical to use than meters or smaller units.