Sound molecules can "stack up" in front of airplanes traveling at very high
speeds. This can cause which of the following?
A. Subsonic speeds
B. Fire
C. A combustion reaction
D. Sonic booms
Explanation: There is no such thing as a "sound molecule" so the answer to the question is no. The sonic boom associated with supersonic flight is associated with pressure waves built up in front of the aircraft (like the bow wavers from a boat) that radiate outward at supersonic speeds. These create a sound.
