Final answer:
None of the options (people skills, leadership, integrity, technical skills) listed is the correct answer since all are essential competencies of an effective project manager, involving communication, decision-making, transparency, and project-specific knowledge.
Step-by-step explanation:
In the context of effective project management, all of the options listed - people skills, leadership, integrity, and technical skills - are generally considered critical competencies. People skills involve building trust through good communication and negotiation, critical for resolving disputes and fostering sustainability in team projects. Leadership encompasses making quick decisions and guiding team members towards aligned goals. Integrity involves being open, forthcoming, and transparent. Finally, technical skills refer to the specific knowledge and expertise required to manage the project effectively. Therefore, none of these choices is a correct answer as they all rank high in the list of a project manager's competencies.