Solution: A. Address the issue with the specific team members who violated the ground rules.
Conflict should be addressed first and usually in private, using a direct, collaborative approach. It's important for the project manager to be firm but also understanding and to work with the team members to find solutions to any issues that may be causing them to violate the ground rules.
The other answer choices are incorrect. They do not promote a healthy team spirit. If disruptive conflict continues, formal procedures may be used, including disciplinary actions.
Removing team members who violated the ground rules or promoting all team members who do not violate any ground rules are not appropriate or effective solutions. Allowing the team to investigate any team members who violate the ground rules can create a negative and divisive team environment.