An Eagle's Eye for Detail is needed for this one.

I understood the question.

Study people easily angered--> more likely to have permanent high blood pressure--> More likely to get Heart Disease

Conclusion: Heart Disease can result from psychological factors (Anger)

I see E and look at it, and think it says "Psychological factors" cause both anger and high blood pressure. I then, think to myself, well, that wouldn't weaken the argument because that'd essentially cement the conclusion that "Psychological factors" caused heart disease.

Then, I looked at E again, it said "PHYSiological" which are different from "PSYchological" factors.

To summarize, have an eagle's eye for detail.

http://classic.7sage.com/lsat_explanations/lsat-55-section-1-question-22/