No one who lacks knowledge of a subject is competent to pass judgment on that subject. Since political know-how is a ...

Thank you for the detailed explanation in response to the other question posed on this problem - that answered why A is not the correct answer. I was between A and D, however, and did NOT select D specifically because it contains the phrase "understanding of the social implications", which is NOT the same as "knowledge". The stimulus does not contain "social implications" anywhere, and over the course of my studies, this has been reason enough to rule out an answer choice like this one - it seems reasonable, could be correct, but I shouldn't select it because I cannot point DIRECTLY back to the passage to confirm it's truth... Is there something I have been misinterpreting when it comes to selecting answer choices that can be 100% defended using the passage? A can still be defended just as soundly as D can...the author DOES "rely on a generalization ('political know-how is a matter of insight and style learned through apprenticeship and experience') about the characteristic that makes someone (read: "seasoned politicians") COMPETENT to judgement. Neither answer choice mentions KNOWLEDGE, so this one is confusing for me. Any help is appreciated.