Vaccine denial has all the hallmarks of a belief system that is not (i)____________. The notion that childhood vaccines are driving autism rates has been (ii)____________ by multiple epidemiological studies. Yet the true believers are (iii)____________, critiquing each new study that challenges their views, and rallying to the defense of disgraced researchers whose work was retracted. A. amenable to refutation B. resuscitated C. indignant D. susceptible to fashion E. documented F. persistent G. open to criticism H. upended I. phlegmatic