Which of the following can help a development team stay on track and work towards a common goal?

participate in regular team meetings
communicate via email only
work only with their team until the testing stage
make all changes and revisions at the end of the development process

The most appropriate option to help a development team stay on track and work towards a common goal is to "participate in regular team meetings." This allows the team members to discuss progress, address concerns, and align their efforts towards achieving the common goal. Communication and collaboration are essential in maintaining focus and meeting project objectives.