The absolute configuration of the compound is

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(B) To determine the absolute configuration,we assign priorities to the groups attached to each chiral carbon using the Cahn-Ingold-Prelog $(CIP)$ rul

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$2S, 3S$

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(B) To determine the absolute configuration,we assign priorities to the groups attached to each chiral carbon using the Cahn-Ingold-Prelog $(CIP)$ rules.For $C-2$ (top chiral center): The groups are $-Cl$ $(1)$,$-CH(Cl)C_2H_5$ $(2)$,$-CH_3$ $(3)$,and $-H$ $(4)$. Since the lowest priority group $(-H)$ is on a horizontal bond,the configuration is reversed. The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is clockwise $(R)$,so the actual configuration is $S$.For $C-3$ (bottom chiral center): The groups are $-Cl$ $(1)$,$-CH(Cl)CH_3$ $(2)$,$-C_2H_5$ $(3)$,and $-H$ $(4)$. Since the lowest priority group $(-H)$ is on a horizontal bond,the configuration is reversed. The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is clockwise $(R)$,so the actual configuration is $S$.Thus,the configuration is $2S, 3S$.

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