A new study provides more support for the hypothesis that social support may strengthen people’s immune system. This study actually found that social isolation and loneliness can impair the immune system. According to the findings of the study, lonely and socially-isolated first-year students mounted a weaker immune response to the flu shot than other students.
The argument is flawed primarily because
(A) it assumes that there can only be one cause for an effect
Nowhere is this stated or implied so this cant be the answer(B) it assumes that a necessary condition for an event is a sufficient condition for that event to occur
The argument is not saying that loneliness is the necessary condition for a weaker immune system so this choice us also eliminated.(C) it assumes that if a cause for an effect is removed, then the effect will in turn get reversed
This is closest to the argument in the passage as students who are not isolated (other students) don’t have a weaker response to flu shots.
But this should not mean that if loneliness is removed than the immune system will get ok and hence this is the flaw in the reasoning(D) it mistakes a symptom for a cause
Cause is isolation and loneliness so this option is not possible.(E) it is based on unverified and subjective data
Nowhere is it said that the data is unverified.