Which of the following situations is clearly inconsistent with the law of diminishing marginal utility? a. A person with a huge appetite eventually turning away food at an all-you-can-eat buffet b. Some western ski areas closing down when there is still considerable snow in the mountains in May because they can no longer attract enough skiers to the slopes c. New residents of the California coast visiting the beach much more frequently than long-term residents or natives d. Diamond jewelry consumption having no disutility to the elite class as it signals prestige