Hey, so according to the question bank, PT21.S2.Q21 is parallel flaw is that the you're asking about? Since you mentioned that a seems to strengthen the argument
@SSBM1000 thanks for replying!
Here’s the link to the discussion:
https://www.manhattanprep.com/lsat/forums/q21-two-doctrines-have-been-greatly-t2249.html
I was mainly confused by ManhattanPrepLSAT1’s explanation.