Concept:The sentence requires a word that means preventing someone from achieving or completing something.Explanation:The correct choice is "thwart.""Thwart" means to prevent someone from accomplishing something or to stop a plan from succeeding."Fight" means to struggle or combat."Disrupt" means to interrupt or cause disorder."Disturb" means to bother or interrupt someone's peace.Among the options, only "thwart" best expresses the idea of preventing success.Answer:C. thwart