Rewrite the sentence in the passive voice.
When Ram arrived home, police arrested him.

Correct option is C

The correct option is (c) When Ram arrived home, he was arrested by police.
Definition of Active Voice: In active voice, the subject of the sentence performs the action.
Definition of Passive Voice: In passive voice, the subject of the sentence receives the action.
Tense identification: The sentence is in Simple Past Tense.
Rule: In Simple Past Tense, the structure for changing active to passive is:
Active voice: Subject + V2 + Object.
Passive voice: Object + was/were + V3 + by + Subject.
Corrected sentence: When Ram arrived home, he was arrested by police.