哪位能帮忙看一下这个文章是什么意思啊，看懂了，可是不明白这是怎么推的？
161.
Adult female rats who have never before encountered rat pups will start to show
maternal behaviors after being confined with a pup for about seven days. This
period can be considerably 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?
(A)
The sense of smell in adult female rats is more acute than that in rat pups.
(B)
The amount of scent produced by rat pups increases when they are in the presence
of a female rat that did not bear them.
(C)
Female rats that have given birth are more affected by olfactory cues than are
female rats that have never given birth.
(D)
A female rat that has given birth shows maternal behavior toward rat pups that
she did not bear more quickly than does a female rat that has never given
birth.
E
(E)
The development of a female rat's maternal interest in a rat pup that she did
not bear is inhibited by the odor of the pup.
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