Concentrated hydrochloric acid,when exposed to air,sometimes produces a white cloud of smoke. What is the explanation for this?

• A
  Due to strong affinity for water,concentrated hydrochloric acid absorbs moisture from the air. This moisture forms water droplets,creating a cloud.
• B
  Concentrated hydrochloric acid always releases pungent $HCl$ gas.
• C
  Oxygen in the air reacts with the released gas to form a cloud of chlorine gas.
• D
  Due to the strong affinity of $HCl$ gas for moisture in the air,it forms droplets of liquid solution that appear as a smoky cloud.