单选题：What is the general guideline the Rand researchers suggest a

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题目类型：单选题
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题目内容：

What is the general guideline the Rand researchers suggest about junk food control? A．Guiding people to make rational choices about food.
B．Enhancing people's awareness of their own health.
C．Borrowing ideas from alcohol control measures.
D．Resorting to economic, legal and psychological means.

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