In the following question, a sentence has been given in Active/Passive Voice. Out of the four alternatives suggested, select the one which best express the same sentence in Passive/Active Voice.
Grid failure brings five hundred trains to a halt.

Options

A. Five hundred trains are being brought to a halt by grid failure.
B. Five hundred trains are brought to a halt by grid failure.
C. Five hundred trains were brought to a halt by grid failure.
D. Five hundred trains had been brought to a halt by grid failure.

Answer

B