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(A) The reaction involves a nucleophilic substitution at a chiral alkyl halide center in the presence of a nucleophile $(PhS^-)$ and a polar aprotic s

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(A) The reaction involves a nucleophilic substitution at a chiral alkyl halide center in the presence of a nucleophile $(PhS^-)$ and a polar aprotic solvent (dimethylformamide). This reaction proceeds via an $S_N2$ mechanism. In an $S_N2$ reaction,the nucleophile attacks from the side opposite to the leaving group,resulting in the inversion of configuration (Walden inversion). Since the starting material has the $Br$ atom in a wedged configuration,the $SPh$ group will be in a dashed configuration in the product. Therefore,the correct product is the one where the $SPh$ group is in the dashed bond configuration.

The major product of the following reaction is

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