Which of the following is least reactive in a nucleophilic substitution reaction?

Which of the following is least reactive in a nucleophilic substitution reaction?
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Which of the following is least reactive in a nucleophilic substitution reaction? A. `(CH_(3))_(3)C-Cl` B. `CH_ ... 3)CH_(2)Cl` D. `CH_(2)=CHCH_(2)Cl`
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