The correct answer is
C: Silentium invented the Quiet Bubble, which can reduce ambient noise in a zone around a person's head without the necessity of wearing noise-canceling headphones (sort of like your own personal Get Smart Cone of Silence).
The correct answer is
C: Silentium invented the Quiet Bubble, which can reduce ambient noise in a zone around a person's head without the necessity of wearing noise-canceling headphones (sort of like your own personal Get Smart Cone of Silence).