The human brain and its associated mental capacities evolved to assist self-preservation. Thus, the capacity of make aesthetic judgments is an adaptation to past environments in which humans lived. So an individual' s aesthetic judgments must be evaluated in terms of the extent to which they promote the survival of that individual. Which one of the following is a principle that would, if valid, provide the strongest justification for the reasoning above? ['All human adaptations to past environments were based on the human brain and its associated mental capacities.', 'Judgments that depend on individual preference or taste cannot be evaluated as true or false.', 'If something develops to serve a given function, the standard by which it must be judged is how well it serves that function.', 'Human capacities that do not contribute to the biological success of the human species cannot be evaluated.']