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(B) The reaction involves the substitution of a tosylate group $(-OTs)$ with an iodide ion $(I^-)$ in the presence of a polar aprotic solvent,$DMSO$ (

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(B) The reaction involves the substitution of a tosylate group $(-OTs)$ with an iodide ion $(I^-)$ in the presence of a polar aprotic solvent,$DMSO$ (Dimethyl sulfoxide). This reaction proceeds via an $S_N2$ mechanism. In an $S_N2$ reaction,the nucleophile $(I^-)$ attacks the electrophilic carbon from the side opposite to the leaving group $(-OTs)$,resulting in an inversion of configuration at the chiral center. Therefore,the major product is the one where the $-OTs$ group is replaced by $-I$ with an inverted stereochemistry.

Major product which you expect in the above reaction is

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