Change the following Direct speech into indirect speech. James said to his teacher, "I have cleaned it as best as I could".

• A. James told his teacher that he had cleaned it as best as he could
• B. James told his teacher that he has cleaned it as best as he could
• C. James said to his teacher I have cleaned it as best as I could
• D. James told his teacher that he was cleaned it as best as I could.
• E. None of these