Some researchers believe that some people suffer from asthma due to emotional problems. Negative emotions such as anxiety, depression, and anger can cause the body to release substances such as histamine, which triggers asthma. However, opponents believe that the increased excitability of the vagus nerve and Reduced sympathetic response is the cause of asthma and has nothing to do with the patient's emotional problems. Which of the following, if true, would most weaken the opponent's point of view? ['Modern medicine has proven that negative emotions can also induce physical illness.', 'Asthma attacks can cause emotional anxiety, depression, and anger in patients.', 'Negative emotions such as anxiety, depression, and anger are common problems in modern people.', 'Negative emotions increase the excitability of the vagus nerve and reduce the responsiveness of the sympathetic nerve.']