According to the passage，teamwork is more important for a start-up company because a start-up company ___.

A、needstostrengthenitsteamspirittofunctionmoreefficiently
B、needstobuildupitsteaminordertoexpanditsbusiness
C、alwayswantstocreatesomethingnewtobemorecompetitive
D、hasasmallstaffbutbigplans，soworkershavetocooperatewithothers