Correct Answer: D
A project manager must possess a variety of skills to be successful. The ability to multi-task is essential, as project managers often need to handle several tasks and projects simultaneously. Managing competing demands is also crucial, as they must balance different stakeholders' needs, project requirements, and resource constraints. Self-confidence is important for making decisions, leading teams, and navigating the complexities of projects. Therefore, all these skills are critical for a project manager to effectively lead and deliver successful projects.
References: The importance of these skills is supported by various sources within the field of project management, including literature on Project Portfolio Management (PPM) skills and the PMBOK Guide, which outline the competencies required for effective project management1234.