A car starts at point X. It travels 3.0 km due east, then 4.0 km due south, then
6.0 km due west and finally 8.0 km due north.
How far away is the car from point X when it has reached the end of this journey?
[Assume that all distances moved are on a flat horizontal surface, and that point X is on the equator. You may ignore any curvature of the Earth.]
A. 5.0 km
B. 21.0 km
C. 10.0 km
D. 7.0 km
E. 2.0 km