After an Adolescent Diagnosed with Attention-Deficit/hyperactivity Disorder (ADHD)begins Methylphenidate (Ritalin)therapy,the

After an adolescent diagnosed with attention-deficit/hyperactivity disorder (ADHD) begins methylphenidate (Ritalin) therapy,the nurse notes that the adolescent loses 10 pounds in a 2-month period.Which is the best explanation for this weight loss?

A) The pharmacological action of Ritalin causes a decrease in appetite.
B) Hyperactivity seen in ADHD causes increased caloric expenditure.
C) Side effects of Ritalin cause nausea;therefore,caloric intake is decreased.
D) Increased ability to concentrate allows the client to focus on activities rather than food.