Of patients over 65 years old who survived coronary bypass surgery-a procedure widely prescribed for people with heart disease-only 75 percent benefited from the surgery. Thus it appears that for one in four such patients, the doctors who advised them to undergo this surgery, with its attendant risks and expense, were more interested in an opportunity to practice their skills and in their fee than in helping the patient.
Which of the following, if true, most seriously undermines the argument?
Ofpatients over 65 years old who survived coronary bypass surgery—a procedurewidely prescribed for people with heart disease—only 75 percent benefited fromthe surgery. Thus it appears that forone in four such patients, the doctors who advised them to undergo thissurgery, with its attendant risks and expense, were more interested in anopportunity to practice their skills and in their fee than in helping thepatient. Whichof the following, if true, most seriously undermines the argument? A.Many of the patients who receive coronary bypass surgery are less than 55 yearsold. B.Possible benefits of coronary bypass surgery include both relief from troublingsymptoms and prolongation of life. C.Most of the patients in the survey decided to undergo coronary bypass surgerybecause they were advised that the surgery would reduce their risk of futureheart attacks. D.The patients over 65 years old who did not benefit from the coronary bypasssurgery were as fully informed as those who did benefit from the surgery as tothe risks of the surgery prior to undergoing it. E.The patients who underwent coronary bypass surgery but who did not benefit fromit were medically indistinguishable, prior to their surgery, from the patientswho did benefit.
To undermine this argument, you need focus on the one of four(the other 25%) who does not benefit from this surgery. If there are other reasons that cause the mission unaccomplished rather than those have been listed by the author then it serves the purpose.
B only focus on the 75% so it does not undermine anything but rather strength one point in this argument.