(2R,3R)-2,3-dihydroxybutanedioic acid (tartaric acid) and (2R,3S)-2,3-dihydroxybutanedioic acid are related as:

Aidentical compounds
Bdiastereomers
Cconstitutional isomers
Denantiomers

Answer: B

They have the same constitution and the same connectivity but differ in configuration at only one of the two stereocentres. They are therefore stereoisomers that are not mirror images, i.e. diastereomers. The (2R,3S) form is the achiral meso acid.

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