[求助]一道把我绕死的PREP逻辑

Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?

(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.

(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.

(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.-------答案

谁能翻译下解释下啊~~~~~~

牛牛~~~~~~~~~HELP ME~~

Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five. (30%的订单是来自35岁以下的杂志subscriber)

Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five. (多数的订单来自35岁以下的人）

For both of the findings to be accurate, which of the following must be true?

(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five. (这个最多是猜测，无从考量）

(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. （not related to the argument)

(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. （not true)

(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over. （so what!? not helping us at all)

(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine (我不太会解释，但是如果仔细读懂题目的话，就很轻松的发现这就是答案）

谢谢啊非常感谢~~~`

是不是就是说 大多数定单是35岁以下的人定的,但是定杂志的只有30%是35岁以下的,所以有很多的人木有定杂志....

这个真的很绕绕绕绕绕啊....