In the following questions, a sentence has been given in Active/passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice.Question: The watchman switched on the lights before it began to grow dar.

• A. the lights were only switched on before it began to grow dark.
• B. The lights are being switched on before it began to grow dark.
• C. The lights were being switched on by the watch man before it began to grow dark.
• D. The lights were switched on by the watchman before it began to grow dark.