For a certain race,3 teams were allowed to enter 3 members each.A team earned 6-n points whenever one of its member finished in nth place where 1<=n<=5.There were no ties,disqualifications and withdraws.If no team earned more that 6 points,what is the least possible score a team could have earned?

A.0 B.1 C.2 D.3 E.4

这题原来会做，隔了几天就怎么也想不起来怎么做了，恳请哪位大侠指点一下，不胜感激！