Comprehensive and Detailed In-Depth Explanation:

In agile project management, fostering a collaborative and cohesive team environment is crucial for project success. When a team experiences declining morale, mistrust, and isolation, it's essential to implement strategies that encourage teamwork and mutual support.

Option C: Promote cross-training and mentoring among team members.

Cross-training involves teaching team members multiple skills beyond their primary roles, enabling them to understand and perform various functions within the team. Mentoring pairs less experienced members with seasoned colleagues to facilitate knowledge transfer and build trust. These practices offer several benefits:

Enhanced Collaboration: Team members gain a better understanding of each other's roles, leading to improved empathy and cooperation.

Increased Flexibility: A multi-skilled team can adapt more readily to changes and cover for one another as needed.

Improved Morale: Opportunities for learning and growth can boost job satisfaction and reduce feelings of isolation.

The PMI-RMP® Exam Prep Study Guide emphasizes the importance of team development activities, stating that "promoting cross-training and mentoring fosters a collaborative environment and enhances team performance" (Fremouw, 2021, p. 134).

Option A: Introduce performance standards and evaluation methods.

While establishing clear performance standards is important, focusing solely on evaluation methods may not address underlying issues of morale and mistrust. Without first building a supportive team culture, performance evaluations could exacerbate feelings of isolation or competition.

Option B: Clarify project goals and project contract constraints.

Clarifying project goals and constraints is essential for alignment but doesn't directly tackle interpersonal issues within the team. While understanding objectives can provide direction, it doesn't necessarily improve team dynamics or morale.

Option D: Develop a reward system related to position and years of experience.

Implementing a reward system based on tenure and position may inadvertently reinforce hierarchies and contribute to feelings of inequality, further diminishing morale. Recognition programs are more effective when they acknowledge contributions and achievements rather than inherent characteristics like position or seniority.

In summary, promoting cross-training and mentoring (Option C) directly addresses the issues of declining morale, mistrust, and isolation by fostering a culture of collaboration, learning, and mutual support, leading to enhanced productivity and a cohesive team environment.