What was the initial reaction of the individual's PI regarding the disagreement on the thesis analysis?

The correct answer reflects that the principal investigator (PI) had a negative reaction towards the disagreement on the thesis analysis, indicating displeasure with the questioning. In a research setting, PIs are often protective of their projects and may feel challenged when their analyses or methodologies are questioned. This reaction can stem from a desire to maintain authority over the research and a belief that challenges to their views could undermine the progress of the work or the relationship with their mentee.

This scenario might also highlight the dynamic of power and communication in academic settings, where junior researchers need to navigate their relationships with mentors delicately. Addressing disagreements thoughtfully, especially when they involve critical aspects of research, can lead to essential discussions about methodology and interpretation, but such exchanges need to maintain respect for the established hierarchy and the experience of the PI.

While other options present more positive or collaborative engagements, those do not accurately capture the initial reaction indicated in the question. The situation emphasizes the complexities that can arise in academic discussions and the importance of being prepared for various reactions when presenting new ideas or critiques.