In the following questions, a sentence has been given in Active/passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice.Question: The student has learnt the answer by heart.

• A. The answer was learnt by the student by heart.
• B. The answer is learnt by heart by the student.
• C. The answer by the student was learnt by heart.
• D. The answer has been learnt by heart by the student.