Concept:The problem involves tracking a person's movement using cardinal directions and finding the straight-line distance from the start.
Explanation:Start at origin (0,0), with east as positive x-direction.
1. Walk 75 m east → position (75, 0).
2. Turn left (now north), walk 25 m → position (75, 25).
3. Turn left (now west), walk 40 m → position (35, 25).
4. Turn left (now south), walk 25 m → position (35, 0).
Final position is 35 m east of start, so distance = 35 m.
Answer:Since 35 m is not among the given options, the correct choice is "None of these".