The correct option is B 8 s
The time taken by a pendulum to complete one oscillation is called the time period.
The time taken by the bob to go from one extreme position to the mean position = 2 s.
So, the time taken by the bob to go from one extreme position to another and come back to its inital position = 2 s + 2 s + 2 s + 2 s = 8 s.
Hence, the time period of the simple pendulum = 8 s.