A man walks 30 meters towards South. Then, turning to his right, he walks 30…

Concept: In direction-sense reasoning, track the direction faced after every turn using a compass rule — a right turn rotates the current facing direction 90° clockwise, and a left turn rotates it 90° counter-clockwise. The straight-line distance between the start and the end point (not the total path walked) is found by combining every leg's North-South and East-West components.

Application:

1. Start facing South and walk 30 m South.

2. Turn right (facing South, a right turn points West) and walk 30 m West.

3. Turn left (facing West, a left turn points South) and walk 20 m South.

4. Turn left again (facing South, a left turn points East) and walk 30 m East.

5. Combine the East-West legs: 30 m West followed later by 30 m East returns the walker to the same East-West line, so the net sideways drift is 0 m.

6. Combine the North-South legs: both southward legs (30 m and 20 m) point the same way, so they add up to a net 50 m South of the starting point.

Cross-check: Placing the start at the origin (0, 0), the walker ends at (0, -50) after the four legs — 30 m South, 30 m West, 20 m South, and 30 m East. The straight-line distance from (0, 0) to (0, -50) is 50 m, matching the figure.

Result: The actual separation from the start is 50 m due South. Since 50 m is not equal to any of the specific figures offered (45 m, 80 m, 60 m), the correct choice is "None".