According to medical theory, a person must have enough exercise to get healthy, but urban people often use vehicles such as cars to move without sufficient exercise. Therefore, this medical theory does not hold. Which of the following are most likely the premise of the above argument:. ['Urban life is fast.', 'Some city people pay attention to exercise for health.', 'Travelling by transport is necessary for people in the city.', 'People in the city cannot be unhealthy.']