Q. 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.