OG 6,请大家给个思路！

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6. Company Alpha buys free-travel coupons from people who are awarded the coupons by Bravo Airlines for flying frequently on Bravo airplanes. The coupons are sold to people who pay les for the coupons than they would pay by purchasing tickets from Bravo. This making of coupons results in lost revenue for Bravo. To discourage the buying and selling of free-travel coupons, it would be best for Bravo Airlines to restrict the A. number of coupons that a person can be awarded in a particular year B. use of the coupons to those who were awarded the coupons and members of their immediate families C. days that the coupons can be used to Monday through Friday D. amount of time that the coupons can be used after they are issued E. number of routes on which travelers can use the coupons

这道题没有思路，请大家帮忙！

xxyy

附上OG的解释：

Restricting use of the coupons to the immediate families of those awarded them, as B suggests, would make the coupons valueless for anyone else, so that marketing the coupons would no longer be possible. The coupons, however, would still allow the people to whom Bravo gives them to enjoy free travel. Thus, awarding coupons would remain a strong incentive to frequent travel on Bravo. Therefore, B is the best answer. A would do nothing to reduce the resale value of the coupons. C, D and E all not only fail to prevent Alpha’s coupon sales from competing with Bravo’s own ticket sales, but also potentially reduce the usefulness of the coupons to the people to whom they are awarded.

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这题说有人将免费赠送的机票进行倒卖。

问B公司应该采取什么措施来限制这种行为。

B选项说限制赠票的使用范围，实际上就是使得倒卖的市场没有了。