Which of the following is CORRECT about team work？A．Team spirit enhances individuals" perf

Which of the following is CORRECT about team work？

A．Team spirit enhances individuals" performances to some extent.

B．It"s a hard job to improve team work.

C．The core of team dynamics is the capability of the leader.

D．Team training is much more effective than individual coaching.

请帮忙给出正确答案和分析，谢谢！