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://7sage.com/lsat_explanations/lsat-55-section-1-question-22/
Comments
I know the LSAT caught me once or twice because I read "underLIE" as "underMINE" which, as you may notice, are entirely opposite. Dirty LSAT!
In case anyone wants to see the video explanation: http://7sage.com/lsat_explanations/lsat-51-section-1-question-22/