Explanation
= According to the PMBOK Guide, communication is one of the key skills of a project manager, and it is essential for building and maintaining relationships with the project stakeholders, including the project team.
Communication can help to create a shared understanding of the project vision, goals, benefits, and expectations, as well as to address any issues, concerns, or conflicts that may arise during the project.
Communication can also foster trust, collaboration, and motivation among the project team members, and enhance their performance and satisfaction. In this scenario, the project manager should communicate the project's impact and plans to engage the project team throughout the project, as this can help to overcome the pessimism and resistance of some team members, and to align them with the project objectives and tasks.
Providing team members with specific and clear instructions, escalating the team's concerns and asking for a change in the team's composition, or engaging the functional managers to describe the project's impact are not the best options, as they may not address the root cause of the team's pessimism, or may even worsen the situation by creating moreconfusion, resentment, or detachment among the team members. References: = PMBOK Guide, 7th edition, pages 50-51, 58-59, 62-63.