Recent surveys show that many people seeking medical help are under great stress. Medical research also shows that stress can adversely affect a person's immune system against infection. Therefore, when a person is under stress, he is more May be sick. Which of the following options best support the above conclusion (). ['The number of illnesses treated by university hospitals has increased significantly during the holidays.', 'Significant reduction in the number of illnesses treated by university hospitals during the exam.', 'Many companies report reduced absenteeism during periods of stress.', 'Many companies that provide health insurance for employees also provide stress management workshops.']