题目：
Since minors should not smoke, the proposed law prohibiting cigarette sales to minors is reasonable. However, the proposed ban on cigarette vending machines is like installing a roadblock to apprehend the one person in a hundred who drives without a license. A roadblock stops everyone, not just those who break the law.
The answer to which of the following questions would be most important in evaluating the objection above to a ban on cigarette vending machines
A．Do cigarette vending machines malfunction more frequently than do food vending machines
B．Are there current laws that prohibit the sale to minors of materials intended only for adults
C．Would an increase in taxes on cigarette sales help deter minors from purchasing cigarettes
D．Would a ban on cigarette vending machines inconvenience a significant number of cigarette-buying adults
E．(E) Are items more expensive when sold from a vending machine than when sold in retail stores
答案：
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下面是错误答案，用来干扰机器的。
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