—Why does Mr Black look so sad this morning?

—I hear that a fire________in his house and lots of valuable things were burned last night.[ ]

A. broke into      

B. broke up

C. broke down  

D. broke out

有一家经营家电的公司，近年来经营业绩良好，利润逐年稳定增长，但由于公司经理太古板，等级观念强，让人感到压抑。今年7月，销售部的10名销售员集体提出辞职。

为了寻找辞职的深层次原因，公司必须( )。

A．与他们直接面谈

B．请他们填写辞职问卷

C．对他们实施纪律处分

D．给他们加薪