Question

"the king was convinced by none of these answers" change the voice.

Answer 1

None of these answers convinced king.
Hope this helps :)

Answer 2

None of the answers convinced the King. This is the answer.

Converting into passive voice:

• In the active voice of a sentence, the subject acts upon the verb
• When a sentence in active voice is converted to passive voice certain changes take place.
• In passive voice, the subject becomes the receiver of the verb's action.
• Hence roles are interchanged.
• The correct option is: None of the answers convinced the King.