Final answer:
A nurse would administer Methylphenidate to treat a client with ADHD, as it is a stimulant drug that aids in managing symptoms by increasing focus and reducing impulsivity.
Step-by-step explanation:
The nurse would expect to administer B. Methylphenidate to a client with Attention-Deficit/Hyperactivity Disorder (ADHD). Methylphenidate is a stimulant drug that increases neurotransmitter activity within certain areas of the brain, such as the prefrontal cortex and basal ganglia, which are associated with impulse control. It is often prescribed to treat ADHD because it can improve focus, decrease impulsivity, and help patients to manage their symptoms.