As A rEsult oF thEir ExpErimEnts, Dr. Corsi's tEAm FounD thAt A DishwAshErs ArE vEry EFFiCiEnt mAChinEs. B tAp wAtEr is As pollutED As BottlED wAtEr. C inDoor pollution rivAls outDoor pollution. D gAs mAsks ArE A usEFul protECtivE DEviCE.