Naresh's movements can be represented as follows:

1. Naresh walks 30m towards south.
2. Naresh turns right and walks 30m.
3. Naresh turns left and walks 20m.
4. Naresh turns left again and walks 30m.

To find out how far Naresh is from his initial position, we need to analyze his movements in terms of direction and distance.

1. Naresh walks 30m towards south:
- We can represent this movement as going down on a coordinate grid.

2. Naresh turns right and walks 30m:
- Turning right means Naresh is now moving towards the west direction.
- This movement can be represented as moving left on the coordinate grid.
- Naresh walks 30m towards the west.

3. Naresh turns left and walks 20m:
- Turning left means Naresh is now moving towards the south direction again.
- This movement can be represented as going down on the coordinate grid.
- Naresh walks 20m towards the south.

4. Naresh turns left again and walks 30m:
- Turning left means Naresh is now moving towards the east direction.
- This movement can be represented as moving right on the coordinate grid.
- Naresh walks 30m towards the east.

Analyzing the movements on the coordinate grid:

- Naresh initially moved 30m towards the south, so he was at (0, -30) on the coordinate grid.
- Then he moved 30m towards the west, which means he moved left on the grid, so his new position is (-30, -30).
- Next, he moved 20m towards the south, which means he moved down on the grid, so his new position is (-30, -50).
- Finally, he moved 30m towards the east, which means he moved right on the grid, so his final position is (0, -50).

To find the distance between Naresh's final position and his initial position, we can use the distance formula:

Distance = √[(x2 - x1)^2 + (y2 - y1)^2]

Here, (x1, y1) represents the initial position and (x2, y2) represents the final position.

Calculating the distance:

Distance = √[(0 - 0)^2 + (-50 - (-30))^2]
= √[0 + (-20)^2]
= √[0 + 400]
= √400
= 20

Therefore, Naresh is 20m away from his initial position.

The correct answer is option C) 50m, which seems to be a mistake in the given options. The correct answer should be 20m.