Caffeine Overconsumption Stimulates the __________ to Produce These Unwelcome Outcomes-Restlessness

Caffeine overconsumption stimulates the __________ to produce these unwelcome outcomes-restlessness, headaches, insomnia and nervous irritability, muscle twitching, tremulousness, psychomotor agitation, and trigger premature left ventricular contractions.

A) central nervous system
B) allosteric central system
C) sensory and transcutaneous nervous systems
D) cranial nerves