Which of the following is NOT mentioned while discussing being successful at the grassroot

Which of the following is NOT mentioned while discussing being successful at the grassroots level？

A．Good coaching, instructions and technique.

B．The import of western coaching way or sending kids to foreign academy.

C．Letting young players get together and compete with each other.

D．Sharing the success stories of Li Na and ask young players to learn from her.

请帮忙给出正确答案和分析，谢谢！