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Answer: Option 2
Prolong : extend the duration of. Obstruct : block (an opening, path, road, etc.); be or get in the way of. Curtail : reduce in extent or quantity; impose a restriction on. Hinder : make it difficult for (someone) to do something or for (something) to happen. Restrain : prevent (someone or something) from doing something; keep under control or within limits. Antonym of Prolong is Curtail
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