Concept:Drug addiction harms a person's mental, social, and academic life.
Explanation:The student uses drugs to cope with stress but now has difficulty concentrating and mood swings.
These effects make it hard to interact normally with family, friends, and classmates.
Drug addiction often leads to withdrawal, conflict, and loss of trust, which damage relationships.
Therefore, the likely effect is the breakdown of social relationships.
Answer:D. Breakdown of social relationships