GMAT Sentence Correction (SC) | Re: 1000 GMAT SC question no 77

Although aspirin irritates the stomach, it can be avoided if the aspirin tablet is given a coating that will not dissolve until the tablet reached intestine.

A)Although aspirin irritates the stomach, it - No need of contrast here just stating a conditional
B) The irritation of the stomach caused by aspirin - Bingo! looks cool
c) The fact that aspirin causes irritation of the stomach - Fact can be avoided. I don't think so, looks funny.
D)Aspirin causes stomach irritation, although it - Although
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