Because the shop _____, all the T-shirts are sold at half price.[ ]

A. has closed down

B. closed down

C. is closing down

D. had closed down

在群体决策中，力图取得多数人的一致意见，其他人给予支持的决策方法是( )。

A．权威决策法

B．多数人决策法

C．共同意见决策法

D．一致意见决策法