Explanation
The project manager should choose emotional intelligence training for their team to help them deal with the difficult stakeholder. Emotional intelligence is the ability to recognize and manage one's own emotions and the emotions of others1. It can help the team to cope with stress, communicate effectively, empathize with others, overcome challenges, and resolve conflicts2. By improving their emotional intelligence, the team can reduce the negative impact of the stakeholder's behavior and enhance their performance and satisfaction. References: = PMBOK Guide 7th Edition, Chapter 4: Team Performance, Section 4.2.2: Develop Team Members and Stakeholders; PMBOK Guide 6th Edition, Chapter 9: Project Resource Management, Section 9.5.2.1: Interpersonal and Team Skills.