Final answer:
Megan is angry with David due to hurtful cyberbullying she experienced on MySpace, which was exacerbated by personal struggles and ultimately led to her tragic death. The context does not mention someone named David directly, and the case is more about the effects of cyberbullying and Megan's interactions with someone named Josh Evans.
Step-by-step explanation:
The situation described appears to concern interpersonal relationships and cyberbullying, rather than a specific academic discipline. However, considering the context involving social interactions, mental health, and the effects of cyberbullying, the subject might best be categorized under Social Studies.
Megan is angry with David because of the hurtful messages and cyberbullying she experienced on the social networking site MySpace. Megan had been dealing with a series of personal challenges, including struggles with weight, attention deficit disorder, and depression. Her online friendship with a boy named Josh Evans, who initially made her feel pretty and wanted, turned sour when Josh no longer wanted to be friends and began sending cruel messages. This situation escalated as other classmates joined in with negative messages, which contributed to Megan's decision to tragically end her own life.
In contrast to Megan's situation, Nadia's anger towards her coworker Beth is not the result of cyberbullying but rather frustration over repeated tardiness and irresponsible behavior. Despite her anger, Nadia remains outwardly friendly and does not confront Beth about the issue.