Stimulants used to treat attention-deficit/hyperactivity disorder (ADHD) may work by increasing levels of ________ in the synapses of the brain.

A) cortisol
B) dopamine
C) acetylcholine
D) epinephrine

Stimulants used to treat ADHD, such as Ritalin and Adderall, work by increasing levels of dopamine in the brain. Dopamine is a neurotransmitter that plays a crucial role in attention, motivation, and reward processing. By increasing dopamine levels in the synapses of the brain, these medications can improve symptoms of ADHD, such as difficulty paying attention and impulsivity.