(单选题) Which of the statements can best sum up the passage? ( )(本题3.0分)

A、 The executive has a higher status than the visitor.
B、 Military people wear uniforms but the businessmen do not
C、 A study revealing a set of rules about the status of businessmen.
D、 It is a good method to use a series of silent film in research.
出自:黑龙江省教育学院口语(专升本)