MathNet 2015-part-06 — 191 problems (EN–VI) Question 24

A hiker walks $1$ km East, then $2$ km North, then $3$ km West, then $4$ km South, then $5$ km East and finally $6$ km North. The hiker's straight-line distance in km from the starting point is
(A) $4$ (B) $5$ (C) $6$ (D) $7$ (E) $8$