Most successful entrepreneurs work at least 18 hours a day, and no one who works at least 18 hours a day has time for leisure activities. But all happy entrepreneurs have time for leisure activities. If the statements above are true, each of the following could be true EXCEPT: ['Some entrepreneurs who work at least 18 hours a day are happy.', 'Some entrepreneurs who work at least 18 hours a day are successful.', 'Anyone who has no time for leisure activities works at least 18 hours a day.', 'Some happy entrepreneurs are successful.']