We went to the dining room after the work had been completed. (make it compound)

• ক The work was completed and then we went to the dining room. ✅ সঠিক উত্তর
• খ The work was completed and than we went to the dining room.
• গ The work was completed and we went to the dining room.
• ঘ We went to the dining room and the work was completed.