A truck travels 10 Km north, then turns towards the east and travels 30 Km, then turns towards the north and travels 20 Km and then turns to its left and travels 30 Km. What is the location of the truck now with respect to its starting position?
A30 Km towards the south
B20 Km towards the north
C30 Km towards the north
D20 Km towards the south