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(A) The transformation involves the reduction of acetophenone to a chiral secondary alcohol where a deuterium atom $(D)$ is added to the carbonyl carb

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$NaBD_4$ in $CH_3OH$

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(A) The transformation involves the reduction of acetophenone to a chiral secondary alcohol where a deuterium atom $(D)$ is added to the carbonyl carbon. $NaBD_4$ acts as a source of deuteride ions $(D^-)$,which perform a nucleophilic attack on the carbonyl carbon of the ketone. The solvent $CH_3OH$ provides the proton $(H^+)$ during the workup to form the hydroxyl group $(-OH)$. Therefore,the reaction of acetophenone with $NaBD_4$ in $CH_3OH$ yields the desired product.

Which of the following reagents would carry out the following transformation? ($D = $ $^2H$)

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