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
Let's think step by step.
discover truth
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.

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The answer is discover truth