Physician: In itself, exercise does not cause heart attacks; rather, a sudden increase in an exercise regimen can be a cause. When people of any physical condition suddenly increase their amount of exercise, they also increase their risk of heart attack. As a result, there will be an increased risk of heart attack among employees of this company due to the new health program. The conclusion drawn by the physician follows logically if which one of the following is assumed? ['Employees will abruptly increase their amount of exercise as a result of the new health program.', 'The new health program will force employees of all levels of health to exercise regularly.', "The new health program constitutes a sudden change in the company's policy.", 'All employees, no matter what their physical condition, will participate in the new health program.']