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正解へのアプローチを教えていただけないでしょうか？
内容は理解できているつもりなのですが、アサンプションがどうもつかめません。よろしくお願いします。
A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as physical disease.
The researcher's conclusion depends on which of the following assumptions?
正解は、
(d)Mental illness does not cause people's immune-system activity to decrease.
ちなみに私が選んだ不正解は、
(b)Mental illness is similar to physical disease in its effects on body systems.
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