At 0845，you are approaching the entrances to Thimble Shoal Channel. What channel must you use?（）

A . The South Auxiliary Channel since your draft is less than 25 feet (7.6 meters)，and you are not a passenger vessel

B . The South Auxiliary Channel or Thimble Shoal Channel，but you must remain on the right hand side of the main channel

C . The North Auxiliary Channel since you are going to turn to a northerly heading near buoy "12"

D . You are not permitted to use any of the channels，but must remain outside the buoyed channel line