I'll give you a question, please answer with step-by-step reasoning process. The police had been stumped for years, the grieving family hired a private investigator in a hope to what?\nOptions:\n- notice physical evidence\n- arrest criminal\n- gather evidence\n- discover truth\n- gathering facts

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Discover truth means a wish to know the fact or reality. The police had been stumped for years; the grieving family hired a private investigator in a hope to discover truth.
The answer: discover truth.
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