Critical Reasoning (CR) | A researcher discovered that people who have low levels of

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 against physical disease.

Conclusion : Immune system protects against mental illness as well as against physical disease.
A. High immune-system activity protects against mental illness better than
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