Manna asked Rohan, Have you sat in a trolley bus before?

• A. Manna asked Rohan whether he had sat in a trolley bus earlier.
• B. Manna asked Rohan had he sat in a trolley bus before.
• C. Manna asked Rohan if he sat on a trolley bus before.
• D. Manna asked Rohan if he has ever sat in a trolley bus