The correct answer is (D) The white or colored concentric rings that are seen around a luminous body, especially the sun or moon. Also, the upper atmosphere of the sun that appears as a halo during a total eclipse.

Examples of use:

• A corona is produced by the diffraction of light from the sun or the moon through a cloud of water drops.
  
  
• Because the Sun's corona is so hot, it emits very high energy radiation.