Numerous books describe the rules of etiquette. Usually the authors of such books merely codify standards of behavior by classifying various behaviors as polite or rude. However, this suggests that there is a single, objective standard of politeness. Clearly, standards of politeness vary from culture to culture, so it is absurd to label any one set of behaviors as correct and others as incorrect.

Question: The reasoning in the argument is most vulnerable to criticism on the grounds that the argument
Options:
A. reaches a conclusion about how people actually behave on the basis of assertions regarding how they ought to behave
B. bases a generalization about all books of etiquette on the actions of a few authors
C. fails to justify its presumption regarding the influence of rules of etiquette on individual behavior
D. overlooks the possibility that authors of etiquette books are purporting to state what is correct behavior for one particular culture only
E. attempts to lend itself credence by unfairly labeling the position of the authors of etiquette books 'absurd'
Answer: "D"