Which of the following behaviors might indicate a problem with interpersonal relationships in a young adult?

The behavior of difficulty forming intimate relationships is a strong indicator of potential problems with interpersonal relationships, especially in a young adult. This difficulty may suggest underlying issues such as anxiety, fear of vulnerability, attachment problems, or previous traumatic experiences that impact an individual's ability to connect emotionally with others. Forming intimate relationships is a critical developmental task in young adulthood, and struggles in this area can significantly affect one's social life, mental health, and overall well-being.

While the other behaviors listed could be related to various personal or developmental factors, they do not specifically point to an interpersonal relationship issue in the same direct way. For instance, excessive independence from parents may indicate a healthy pursuit of autonomy or personal growth. Avoidance of teamwork might stem from personality traits or preferences rather than interpersonal challenges. An intense focus on career aspirations can be a positive trait that suggests ambition and drive, but it does not inherently reflect issues in forming or maintaining personal relationships. Thus, difficulty in forming intimate relationships stands out as the most definitive behavior indicating potential interpersonal problems.