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?
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AThe sense of smell in adult female rats is more acute than that in rat pups.
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BThe amount of scent produced by rat pups increases when they are in the presence of a female rat that did not bear them.
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CFemale rats that have given birth are more affected by olfactory cues than are female rats that have never given birth.
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DA 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.
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EThe 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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正确答案: E