In which appeal does the idea of "getting things mail-order by catalog" fit, according to the context provided?

The idea of "getting things mail-order by catalog" fits best with the concept of passing from the acceptable to the dubious. This appeal often involves making a suggestion or presenting an option in a way that shifts from a commonly accepted idea to one that might be considered less acceptable or questionable. By promoting the idea of mail-order purchases, one might start with the normal and practical notion of shopping and then introduce potentially dubious implications or issues that come with it, such as quality concerns, reliability, or ethical considerations of placing orders from distant suppliers without seeing the products first. This move from a standard shopping practice to the implications of such a method effectively captures the essence of this type of appeal, making it the correct fit for the context provided.