Anthropologists assert that cultures advance only when independence replaces dependence—that is, only when imposition by outsiders is replaced by initiative from within. In other words, the natives of a culture are the only ones who can move that culture forward. Non-natives may provide valuable advice, but any imposition of their views threatens independence and thus progress. If one looks at individual schools as separate cultures, therefore, the key to educational progress is obvious that ______.
Which one of the following best completes the passage
A．individual schools must be independent of outside imposition
B．some schools require more independence than others, depending on the initiative of their staffs and students
C．school system officials must tailor their initiatives for change to each individual school in the system
D．outsiders must be prevented from participation in schools’ efforts to advance
E．(E) the more independent a school is, the more educational progress it will make
