The correct option is B 5 km
Distance between town A and town B = 2000 m
Distance between town B and town C = 3000 m
Distance between town A and town C = 2000 m + 3000 m
= 5000 m
We know that,
1000 m = 1 km
5000 m = 5 × 1000 m
= 5 km
Thus, distance between A and C is 5 km.