In the given question, a part of the sentence is printed in bold. Below the sentence alternatives to the bold part are given at (A), (B), (C) and (D) which may help improve the sentence.
The building had been under construction for a long time until a series of unprecedented events led it to a halt.

Options

A. leads it to a halt
B. bringing it to a stop
C. brought it to a halt
D. led it to a stop