No sooner did he see (1)/ the traffic policeman (2)/ he wore seat belt. (3)/No error (4)

Options

A. 1 No sooner did he see
B. 2 the traffic policeman
C. 3 he wore seat belt.
D. 4 No error

Answer

3

Explanation

than he wore the seat belt will replace he wore seat belt because -
No sooner than are the correct correlatives, Look at the examples given below:
No sooner had I arrived at the station than the train came.
No sooner did we hear the noise than we rushed to the spot.