救救我，这道题目怎么做

Adult female rats who have never before encountered rat pups will start to show matural behaviors after being confined with a pup for abour 7 days.This period can be shortened by disabling the female's sense of smell or by removing the scent-producing glands of the pup.                                                                                           .

 Which of the following hypotheses best explains the contrast described above?

答案是：The development of a female rat's maternal interest in a rat that she didn't bear is inhibited by the odour of the pup 。

我不明白问题什么意思啊？还有为什么是这个答案啊？谢谢高人帮助我！快考试了，我好急啊！