________different kinds of pianos, the factory is sure they can satisfy people's needs . [ ]

A. To produce  

B. Being produced

C. Produced  

D. Having produced

我国《保险法》规定：保险合同是投保人与保险人约定保险权利义务关系的协议。投保人是指与保险人订立保险合同，并按照合同约定负有支付保险费义务的人。保险人是指与投保人订立保险合同，并按照合同约定承担赔偿或者给付保险金责任的保险公司。