Look at the part of each sentence inside braces. Below each sentence are given threepossible substitutions for this part. If one of them (a), (b) or (c) is betterthan the underlined part, indicate your responses against the corresponding letter (a), (b) or (c).Suddenly Ilisteneda strange noise

• A. I listen
• B. I heard
• C. I was hearing
• D. No improvement