Concept:A map scale gives the ratio between a distance on the map and the actual distance on the ground.Explanation:The scale is 1:200,000, so 1 cm on the map equals 200,000 cm on the ground.The map distance is 2 cm.Actual distance in cm: 2×200,000=400,000 cm.Convert to meters: 400,000÷100=4,000 m.Convert to kilometers: 4,000÷1,000=4 km.Answer:D. 4 km