Studies have shown that people who sleep more than eight hours have healthier skin than people who usually stay up late. Some financial workers are people who stay up all night, and some sports workers have been sleeping for more than eight hours. Zhang Yu is a sports worker. From this we can infer:. ['Most sports workers have healthier skin than some financial workers.', 'Some sports workers have healthier skin than some financial workers.', 'The skin of some financial workers is healthier than that of Zhang Yu.', "Zhang Yu's skin is healthier than that of some financial workers."]