Answer:
Changed into the passive voice, the sentence becomes:
Ramayan was written by Bhanubhakta.
Explanation:
In the active voice, the subject of the sentence is also the one performing the action. For example: I made a cake.
In the passive voice, the subject is the one receiving or being affected by the action. The performer of the action is the agent of sentence, which appears after "by": A cake was made by me.
Thus, to change a sentence from the active into the passive voice we must:
1. Find the subject of the active voice and change it into the agent: Bhanubhakta --> by Bhanubhakta
2. Find the object of the active voice and change it into the subject: Ramayan
3. Find the verb, identify the tense, maintain the tense, but add the auxiliary "be": wrote (simple past) --> was written
Therefore, we have:
Ramayan was written by Bhanubhakta.