On May first, in order to reduce the number of overdue books, a children's library instituted a policy of forgiving fines and giving bookmarks to children returning all of their overdue books. On July first there were twice as many overdue books as there had been on May first, although a record number of books had been returned during the interim.

Which of the following, if true, most helps to explain the apparent inconsistency in the results of the library's policy?

The librarians did not keep accurate records of how many children took advantage of the grace period, and some of the children returning overdue books did not return all of their overdue books.

Although the grace period enticed some children to return all of their overdue books, it did not convince all of the children with overdue books to return all of their books.

The bookmarks became popular among the children, so in order to collect the bookmarks, many children borrowed many more books than they usually did and kept them past their due date.

The children were allowed to borrow a maximum of five books for a two-week period, and hence each child could keep a maximum of fifteen books beyond their due date within a two-month period.

Although the library forgave overdue fines during the grace period,the amount previously charged the children was minimal; hence, the forgiveness of the fines did not provide enough incentive for them to return their overdue books.

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重点解释为什么不还的书反而变多了

A 无法解释

B 有的还了 那更不能说明不还的变多了

C 提出他因，说明为什么不还的变多了

D 介绍借书的机制 无关

E 没有落实到解释不还的人不降反增

A 不能解释逾期未归的书为什么是政策实施之前的二倍

B 同A

C 书签在孩子们中很受欢迎 好多孩子为了获得书签 去借书直到过期了之后才还 合理解释了为什么尽管很多人还了书 政策实施后的未还书数量是之前的二倍 正确

D 孩子最多在两周时间能借5本书，每个孩子在两个月内最多能留15本书 无关

E 尽管图书馆不罚钱了 但是以前罚的就很少 所以没有足够的激励作用 来让大家还书 但仍旧无法接理解释a record number of books had been returned during the interim.