The letters $'D'$ or $'L'$ before the name of a stereoisomer of a compound indicate the correlation of configuration of that particular stereoisomer. This refers to their relation with one of the isomers of glyceraldehyde. Predict whether the following compound has $'D'$ or $'L'$ configuration.

(B) To determine the $D$ or $L$ configuration of a carbohydrate,we look at the chiral carbon atom farthest from the carbonyl $(-CHO)$ group.
In the given structure,the farthest chiral carbon is the one adjacent to the $-CH_2OH$ group.
Since the $-OH$ group on this carbon is on the left-hand side,the compound has an $L$-configuration.