Question

9. One suggestion for effective teamwork is to resolve disputes _____.

A. secretly
B.at a later date
C.promptly
D.after much debate

Answer 1

C. Promptly. Hope this helps. 

Answer 2

One suggestion for effective team work is to resolve disputes PROMPTLY.
There is no way two or more people will work together without having occasional misunderstanding. Such misunderstanding should be resolved promptly in order to continuously maintain the effectiveness of the team.