Many questions were asked，particularly ______ the cost of the new plan.

A．in reply to

B．in relation to

C．in act to

D．in addition to

马斯洛的“需要层次论”认为人有五种基本需要，按需要等级从高到低排列，最低级的需要是()。

A.自我实现的需要

B.安全需要

C.生理需要

D.尊重的需要