A controversial program rewards prison inmates who behave particularly well in prison by giving them the chance to receive free cosmetic plastic surgery performed by medical students. The program is obviously morally questionable, both in its assumptions about what inmates might want and in its use of the prison population to train future surgeons. Putting these moral issues aside, however, the surgery clearly has a powerful rehabilitative effect, as is shown by the fact that, among recipients of the surgery, the proportion who are convicted of new crimes committed after release is only half that for the prison population as a whole. A flaw in the reasoning of the passage is that it ['dismisses moral considerations on the grounds that only matters of fact are relevant', 'relies on evidence drawn from a sample that there is reason to believe is unrepresentative', 'asserts that the rehabilitation of criminals is not a moral issue', 'allows moral issues to be a consideration in presenting evidence about matters of fact']