GMAT Sentence Correction (SC) | Re: Unlike that of earlier works on slavery, Blassingames

"Unlike" is a comparison marker - once you see a comparison marker, try to identify the two items being compared. One side will generally be easy to identify, in this case "study". Thus you will need to find an option that compares something valid with "study". Once you realize that "works" is the valid thing to compare with "study", A, B, C and E can
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