I did PT 53 recently so this is fresh in my mind. The difference is simple and it has little, if any, to do with the argument structure. Statement B is not flawed because it is a true statement while the other statements (conclusion part) are not necessarily true (they could be true or they could be false). To see the subtle difference in B, think about how the other statements (conclusion) could be false. You can't do the same for B.
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