If one side fails to observe the contract, the other side ( ) cancel it.

A．be entitled to

B．entitled to

C．being entitled to

D．is entitled to

坚持党委领导、群众路线、调查研究（）依法办事是火灾调查人员的行动准则。

A.认真工作

B.实事求是

C.积极负责