Cardiologist: Coronary bypass surgery is commonly performed on patients suffering from coronary artery disease when certain other therapies would be as effective. Besides being relatively inexpensive, these other therapies pose less risk to the patient since they are less intrusive. Bypass surgery is especially debatable for single-vessel disease. The cardiologist's statements, if true, most strongly support which one of the following? ['Needless bypass surgery is more common today than previously.', 'Sometimes there are equally effective alternatives to bypass surgery that involve less risk.', 'Bypass surgery should be performed when more than one vessel is diseased.', 'Bypass surgery is riskier than all alternative therapies.']