Given two molecules, D-glyceraldehyde and L-glyceraldehyde, how would you classify their relationship?

• A. They are diastereomers because they are not mirror images.
• B. They are identical because they have the same chemical formula.
• C. They are constitutional isomers because they differ in connectivity.
• D. They are enantiomers because they are non-superimposable mirror images.

Answer: (D)