The Correct answer is option 'B' - 40 metres.

Explanation:
To find the distance from the starting point, we need to consider the movements Raj made and calculate the net displacement.

1. Raj walked 30 metres towards the north:
Raj's position after this movement is 30 metres north of the starting point.

2. Raj turned right and walked 20 metres:
As Raj turned right, his new direction is now towards the east. He walked 20 metres in this direction.
His position after this movement is 30 metres north and 20 metres east of the starting point.

3. Raj turned right again and walked 30 metres:
Since Raj turned right again, his new direction is now towards the south. He walked 30 metres in this direction.
His position after this movement is 30 metres north, 20 metres east, and 30 metres south of the starting point.

4. Raj turned left and walked 20 metres:
As Raj turned left, his new direction is now towards the east again. He walked 20 metres in this direction.
His position after this movement is 30 metres north, 20 metres east, 30 metres south, and 20 metres east of the starting point.

Calculating the net displacement:
To find the distance from the starting point, we need to calculate the net displacement. This can be done by finding the difference between the total distance travelled in the north-south direction and the total distance travelled in the east-west direction.

- Total distance travelled in the north-south direction:
30 metres north - 30 metres south = 0 metres

- Total distance travelled in the east-west direction:
20 metres east - 20 metres east = 0 metres

Since the net displacement in both directions is zero, Raj's final position is at the starting point. Therefore, he is at a distance of 0 metres from the starting point.

However, it is important to note that the question asks for the distance from the starting point, not the displacement. The distance is the actual length of the path taken, regardless of the direction. In this case, Raj walked a total distance of 30 metres + 20 metres + 30 metres + 20 metres = 100 metres.

Therefore, the distance from the starting point is 100 metres, which is not one of the given options. None of the options provided is the correct answer based on the given information.