PT33.S1.Q21 - attacks on an opponent's character

https://7sage.com/lsat_explanations/lsat-33-section-1-question-21/
I was watching the PSA webinar and I had a question about answer choice C. I initially eliminated C because of "every". I was looking for something closer to what was mentioned in the stimulus. I was thinking "the opponent's argument" instead of "every". I eliminated because it seemed too general or broad. I didn't see how "every" was specifically referring to the opponent's argument but then I thought about "soft" sufficient assumptions that Jimmy mentions in the webinar. Does "every" make this a PSA, thus the right answer? Whereas "the opponent's argument" would've been more of a SA? Am I thinking this out correctly?