Clara has found it extremely difficult to study for extended periods. She feels restless on many occasions and isconstantly stopping work to check for messages on her phone. When she described these and other symptoms to herdoctor, he prescribed a stimulant that eventually helped her to study. The most likely explanation for the doctor'sdecision is that the active ingredient in the stimulantA)blocks the movement of neurotransmitters inhibiting parts of the brain involved in problem solving. B)redirects the signals of neurons that excite brain regions associated with impulsive behavior. C)boosts activity in brain areas that coordinate higher mental functions. D)slows production of neurotransmitters that stimulate reward pathways in the brain.