B) In a western barroom fight our hero is hit over the head with a whiskey bottle. 

The bottle is fake. It becomes real with the addition of an actual glass bottle crash from the sound editors library. In gun battles the weapon actually is actually loaded with blanks and what is called quarter loads which means one fourth of normal amount of gunpowder contained in a real bullet. The actual sound is just slightly louder than a cap pistol until the sound editor has completed work.

C) The temporal frequencies of sound waves are generally expressed in terms of cycles per second. The simplest waveform is the sine wave since it has only one frequency associated with it. The sound waves associated with say music are constantly varying.