The below sentence has been given in Active/Passive voice. From the given alternatives, choose the one which best expresses the given sentence in Passive/Active voice.The invigilator was reading out the instructions.

• A. The instructions were read by the invigilator.
• B. The instructions were being read out by the invigilator.
• C. The instructions had been read out by the invigilator.
• D. The instructions had been read by the invigilator.