Concept:To find the word nearest in meaning to the underlined word in context.Explanation:The underlined word is impair.Impair means to weaken or damage something, especially a physical or mental function.Among the options, attack means to act against violently.Terminate means to bring to an end.Damage means to cause harm or injury.Reduce means to make smaller or less.The closest meaning to impair is damage.Answer:C. damage