The correct answer is (D) In medicine, a bubbling in the blood due to abrupt changes in air pressure, as in the bends.

Examples of use:

• The bubbling in an ebullism is related to the fact that the pressure of the compressed air in the scuba diver's tank must equal the water pressure at the depth to which the diver will descend.
  
  
• In order to avoid the risk of developing an ebullism, the drivers ascended to the surface slowly, stopping briefly several times in their ascent.