Since the early nineties, the trend in most businesses has been toward on-demand, always-available products and services that suit the customer's ______ rather than the company's.

A．benefit

B．availability

C．suitability

D．convenience

在运用分层法对工程项目质量进行统计分析时，通常可以按照（）等分层方法获取质量原始数据。

A.作业班组

B.作业时间

C.工程材料

D.投资主体

E.工程部位