When a society undergoes slow change, its younger members find great value in the advice of its older members. But when a society undergoes rapid change, young people think that little in the experience of their elders is relevant to them, and so do not value their advice. Thus, we may measure the rate at which a society is changing by measuring the amount of deference its younger members show to their elders. Which one of the following is an assumption on which the argument depends? ["Young people value their elders' advice just insofar as the elders' experience is practically useful to them.", "The deference young people show to their elders varies according to how much the young value their elders' advice.", 'The faster a society changes, the less relevant the experience of older members of the society is to younger members.', "How much deference young people show to their elders depends on how much of the elders' experience is practically useful to them."]