To determine which distance uses the most appropriate units, we need to convert all the distances to a common unit or understand the context of the units provided.
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Kilometers: \(3 \times 10^2\) kilometers = 300 kilometers
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Meters: \(3 \times 10^5\) meters = 300,000 meters (which is 300 kilometers)
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Centimeters: \(3 \times 10^7\) centimeters = 30,000,000 centimeters (which is 300 kilometers)
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Millimeters: \(3 \times 10^8\) millimeters = 300,000,000 millimeters (which is 300 kilometers)
Given that Janiya is taking a road trip, the most suitable unit for measuring long distances is kilometers. While all the units ultimately represent the same distance, kilometers are the typical unit used for road distances in many countries.
Thus, 3×102 kilometers is the most appropriate unit for Janiya's road trip.