求助此题，不胜感激！

anthropologist 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 seperate cultures.therefore,the key to educational progress is obvious:

which of following best completes the passage?

A individual schools must be independence of outside imposition

Bsome schools require more independence than others,depending on the initiative of their staffs and students

Cschool system officials must tailor their initiatives for change to each individual school in the system

Doutsides must be prevented from participation in schools' efforts to advance

Ethe more independent a school is ,the more educational progress it will make!

希望高手们能给出答案的理由，谢了！

答案为A，记得讨论过，找找。