这道题我想了很久都不知道为什么选这个。。不是weaken吗。。为什么不选a

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A study of marital relationships in which one partner's sleeping and waking cycles differ from those of the other
partner reveals that such couples share fewer activities with each other and have more violent arguments than
do couples in a relationship in which both partners followthe same sleeping and waking patterns. Thus,
mismatched sleeping and waking cycles can seriously jeopardize a marriage.
Which of the following , if true, most seriously weakens the argument above?
(Al Married couples in which both spouses follow the same sleeping and waking patterns also occasionally
have arguments that can jeopardize the couple's marriage.
(b) The sleeping and waking cycles of individuals tend to vary from season to season.
(c) The individuals who have sleeping and waking cycles that differ significantly from those of their spouses
tend to argue little with colleagues at work.
(d) People in unhappy marriages have been found to express hostility by adopting a different sleeping and
waking cycle from that of their spouses.
(E) According to a recent study, most people's sleeping and waking cycles can be controlled and modified
easily.


A study of married couples reveals that spou ses with different sleeping and waking
cycles tend to have fewer activities in common and more intense arguments than
spouses with similar sleeping and waking cycles. Thus, different sleep-wake cycles may
severely endanger a marriage.
Which ofth e opt ions, ifadded to the argument's premises, would most undermine the
argurnent'ssupportftr th e conclusion? The given premises in the passage provide
information that different sleep-wake cycles tend to be accompanied by marital
discord. The conclusion then asserts that the different sleep-wake cycles cause th e
marital problems. But what if the different sleep-wake cycles result from preexisting
marital problems? The argument would be weakened if data shows that unhappily
married spouses expre ss hostility by deliberately adopting cycles different from those
of their spouses.

aresilenzio

occasionally说明频率不怎么高吧。并且，真正削弱的是d，说明研究搞反了因果，所以研究结论不可靠。