I don't know his whereabouts.

A His whereabouts are not known to me.
B No one knows his whereabouts.
C His whereabouts is not known by me.
D His whereabouts had not been known to me.

Correct Answer: His whereabouts are not known to me.

His whereabouts are not known to me.

Given sentence is in simple present tense and it is in active voice.

Rule :
Subject + (is/am/are) + V3 + Other agents

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