Choose the correct one word for this sentence 'Plea that a person charged with a crime was elsewhere when it was committed.'

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A person who shows people their seats

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Deliberately and maliciously set something (buildings usually) on fire

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One who makes an active effort to promote human welfare

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The date when both, day and night are of approximately equal length

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 'Converting waste into reusable material.'

Select the option that can be used as a one-word substitute for the given group of words. One who feeds on human flesh

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A child born after the death of his father