In the following questions, a sentence has been given in Active/Passive Voice. Out of the four alternative suggested, select the one which best expresses the same sentence in Passive/Active Voice.

I dont know his whereabouts.

A. His whereabouts are not know to me.

B. No one knows his whereabouts.

C. His whereabouts is not know to me.

D. His whereabouts had not been know to me.

Please do not use chat terms. Example: avoid using "grt" instead of "great".