Which of these is not an argument put forth by opponents of the death penalty?

Name: Which of these is not an argument put forth by opponents of the death penalty?
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Question

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Opponents of the death penalty commonly argue that innocent people are sometimes executed, capital punishment is racially biased, it costs more to execute a criminal than imprisoning them for life, and that two wrongs do not make a right. However, social science studies are not a commonly cited argument by opponents of the death penalty.

Which of These Is Not an Argument Put Forth by Opponents