Time-tested practices for developing successful teams are

A) showing enthusiasm, making timely decisions, practicing innovation.
B) admitting mistakes, being flexible, having persistence.
C) giving credit to others, keeping people informed, keeping promises.
D) putting others first and self last.
E) all of these.

All of these practices are time-tested and proven to be effective for developing successful teams. Showing enthusiasm helps to motivate team members, making timely decisions keeps projects on track and avoids delays, practicing innovation encourages creativity and new solutions, admitting mistakes fosters a culture of openness and communication, being flexible allows for adapting to changing circumstances, having persistence helps to overcome challenges, giving credit to others acknowledges their contributions and fosters a positive environment, keeping people informed promotes transparency and avoids misunderstandings, keeping promises builds trust, and putting others first and self last shows a dedication to the team's success rather than individual recognition.