The two structures written below represent:

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(C) To determine the relationship between the two structures,we assign the $R/S$ configuration to the chiral centers.For the first structure $(I)$:The

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same molecule

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(C) To determine the relationship between the two structures,we assign the $R/S$ configuration to the chiral centers.For the first structure $(I)$:The top chiral center has $-OH$ $(1)$,$-CH_2OH$ $(2)$,$-CH_3$ $(3)$,and $-H$ $(4)$. With $-H$ on the horizontal,the configuration is $R$.The bottom chiral center has $-OH$ $(1)$,$-CH(OH)CH_3$ $(2)$,$-CH_2OH$ $(3)$,and $-H$ $(4)$. The configuration is $R$.For the second structure $(II)$:Rotating the Fischer projection by $180^{\circ}$ in the plane of the paper does not change the configuration of the chiral centers.After a $180^{\circ}$ rotation of structure $(II)$,it becomes identical to structure $(I)$.Therefore,both structures represent the same molecule.

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