**Core Concept**
The question requires the selection of a suitable medication for Attention Deficit Hyperactivity Disorder (ADHD) in a pediatric patient, considering the risk of substance abuse in the family. The preferred medication should have a lower potential for abuse and dependence.

**Why the Correct Answer is Right**
The preferred drug for treating ADHD in a pediatric patient is **Atomoxetine**. Atomoxetine is a non-stimulant medication that selectively inhibits the presynaptic norepinephrine transporter, thereby increasing the levels of norepinephrine in the synaptic cleft. This action is thought to improve attention and reduce impulsivity and hyperactivity in ADHD patients. Atomoxetine has a lower potential for abuse and dependence compared to stimulant medications, making it a safer choice for patients with a family history of substance abuse.

**Why Each Wrong Option is Incorrect**
**Option A:** Methylphenidate is a stimulant medication commonly used to treat ADHD, but it has a higher potential for abuse and dependence, making it a less suitable choice for patients with a family history of substance abuse.
**Option B:** Amphetamine is another stimulant medication that can be used to treat ADHD, but it also carries a risk of abuse and dependence, similar to methylphenidate.
**Option C:** Bupropion is an antidepressant medication that can be used off-label to treat ADHD, but it is not the preferred medication for pediatric patients due to its potential for abuse and the availability of safer alternatives.

**Clinical Pearl / High-Yield Fact**
When selecting a medication for ADHD, it's essential to consider the patient's age, medical history, and family history of substance abuse. Non-stimulant medications like atomoxetine may be a safer choice for pediatric patients with a high risk of substance abuse.

**Correct Answer: C. Bupropion**