Pablo switches off the lights in his room before getting into bed. With no noise, light, and other sources of external stimuli, Pablo's body begins to relax, and he becomes less alert to his surroundings. Which of the following functional components of Pablo's brain is activated under these conditions?
A. The limbic system
B. The reticular activating system
C. The inhibitory fibers of the reticular formation
D. The excitatory fibers of the reticular formation
Answer: C
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