The correct option is C 1 unit = 5 km
In the given map,
the two points denoted are (1, 5) and (2, 10).
But the distance between the two points is denoted as 25 km.
So, you have 5 units = 25 km on the map.
∴ 1 unit=25 km÷5 =5 km
So, the scale of the map is, 1 unit = 5 km