A sentence has been given in Active/Passive voice. Out of the four alternatives suggested below, select the one which best expresses the same sentence in Passive/Active voice. 
 

Leo Tolstoy wrote 'War and Peace'.

‘War and Peace’ was written by Leo Tolstoy. 

‘War and Peace’ was written by Leo Tolstoy.

Explanation:

• ’War and Peace' is written by Leo Tolstoy: This construction uses the present tense ("is written") instead of the past tense ("wrote") used in the original sentence.
• ‘War and Peace' will be written by Leo Tolstoy: This construction uses the future tense ("will be written") instead of the past tense ("wrote") used in the original sentence.
• ‘War and Peace' was being written by Leo Tolstoy: This construction uses the past continuous tense ("was being written") which does not accurately convey the simple past tense used in the original sentence.
• ‘War and Peace’ was written by Leo Tolstoy: This construction correctly maintains the past tense and reverses the subject and object to form the passive voice.