题目内容：
根据下面资料，回答题 Karen Rusawas a 30-year-old woman and the mother of four children．For the past severalmonths Karenhad been experiencing repetitive thoughts that centered around her children' s safety．
She frequently found herself imagining that a serious accident had occurred; she was unable to putthese thoughts out of her mind．On one such occasion she imagined that her son, Alan, had brokenhis leg playing football at school．There was no reason to believe that an accident had occurred,but she kept thinking about the possibility until she finally called the school to see if Alan was allright．Even after receiving their assurance that he had not been hurt, she described herself as being
somewhat surprised when he later arrived home unharmed．Karen also noted that her daily routinewas seriously hampered by an extensive series of counting work that she performed throughout eachday．Specific numbers had come to have a special meaning to her; she found that her preoccupation with these numbers was hampering her ability to perform everyday activities．One example wasgrocery shopping．Karen believed that if she selected the first item on the shelf, something terrible
would happen to her oldest child．If she selected the second item, some unknown disaster wouldfall on her second child, and so on for the four children．Karen' s preoccupation with numbers extended to other activities, most notable the pattern in which she smoked cigarettes and drank coffee．If she had one cigarette; she believed that she had to smoke at least four in a row, or one ofher children word be harmed in some way．If she drank one cup of coffee, she felt compelled to
drink four．Karen acknowledged the unreasonableness of these rules, but, nevertheless, maintainedthat she felt more comfortable．,When she observed them earnestly, when she was occasionally intoo great a hurry to observe these rules, she experienced considerable anxiety, in the form of a subjective feeling of dread and fear．She described herself as tense, uneasy, and unable to relax during
these periods．The occurrence of rarely minor accidents does not reduce her belief that she had beendirectly responsible because of her inability to observe the．rules about number．
The main idea of this passage is to ． A．describe a woman who suffered from a psychological disease
B．warn the readers against any imagination
C．explain the reason why Karen had such fanciful thoughts
D．present a case for the readers to study
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答案解析：