What reasoning error is exhibited through David Duke's perceived political viability?

The concept of inconceivability in the context of David Duke’s perceived political viability relates to the idea that certain beliefs or assumptions about political figures can be seen as unreasonable or implausible. In this case, the reasoning error suggests that a rational evaluation of Duke's qualifications and the societal implications of his political stance fails to recognize or accept that a figure with his controversial background and views could realistically be considered a viable candidate. This notion challenges the common-sense understanding of mainstream political acceptance and raises questions about the factors that lead people to view certain candidates as viable despite their extremist views.

While the other options involve reasoning processes or evidence, they do not capture the essence of inconceivability in this context. Arbitrary conclusions might imply a lack of justification, while conclusive evidence suggests a strong basis for arguments, which does not apply when discussing the perception of someone like Duke within a mainstream political framework. Critical analysis refers to a systematic examination of all factors, which may not necessarily lead to the perception of political viability that is deemed inconceivable by many observers. Thus, inconceivability aptly highlights the disconnect between Duke's views and the expectations of typical political candidacy.