单选题 We can infer from the second paragraph that ______.

A、 promotion depends on amiability
B、 chief executives do not work hard enough at the top level
C、 it is the duty of the chief executive to look after the well-being of his subordinates
D、 a chief executive is expected to know more about his company and the industry

【正确答案】 D

【答案解析】第二段倒数第二句讲到执行官应当十分熟悉自己的公司以及所处的行业，所以常常每晚带上满满一公文包的资料回家，因此选D。