He showed me the way to the station ______ a map.

• A. Using
• B. By
• C. On
• D. With

Answer: (C)

The idea being tested is how we connect information to the medium that contains it. When something is shown or drawn on a visual aid, we use “on” to indicate that location or surface. Here, the route to the station is displayed on a map, so the natural way to fill the blank is “on a map.” It means the map itself shows the way.

Using a map would shift the focus to the act of using the map to show the route, which doesn’t fit the sentence structure as smoothly. By a map or with a map aren’t the best fit here because they either sound awkward in this context or don’t specify that the route is depicted on the map.