单选题 FilmPro sells millions of videocassettes directly to consumers at $25 apiece for a $10 profit on each. However, FilmPro is losing money because people are buying illegally copied versions of its $25 videocassettes at far .cheaper prices. So far, one million illegally copied cassettes have been sold for $5 each. Illegal copying, therefore, has cost the company at least $10 million in potential profits.
Which of the following is an assumption that, if true, would allow the conclusion above to be properly drawn?

A、 The price of the illegally copied videocassettes never goes below $5 apiece.
B、 At least one million more cassettes would have been purchased from FilmPro for $25 apiece if the illegally copied cassettes had not been available.
C、 FilmPro refunds money to customers dissatisfied with the original cassettes.
D、 The illegally copied tapes are of such high quality that it is virtually impossible to differentiate between them and the originals.
E、 (E) FilmPro never sells discontinued videocassettes at less than $25 apiece.

【正确答案】 B

【答案解析】[解析] 段落推理为“因为100万盘盗版录像带以5美元一盘出售，所以FilmPro损失了1000万美元的潜在利润”，那么这个推理成立暗含的假设是：正版带也能以每盘25美元，利润10美元卖出100万盘。所以(B)为正确答案；(A)、(C)、(D)均与推理无直接关系；(E)易误选，但“discontinued”段落中没有涉及，所以也不正确。