Final answer:
The correct term that describes two molecules as non-superimposable mirror images of each other is Enantiomers. The option (A) is correct.
Step-by-step explanation:
The term that best describes the relationship between two molecules that are related to each other as non-superimposable mirror images are Enantiomers. Two molecules that are enantiomers share the same chemical structure and chemical bonds but differ in the three-dimensional placement of atoms, making them mirror images of one another.
For example, D-alanine and L-alanine are enantiomers; similarly, D-glucose and L-glucose are enantiomers with D-glucose being the main product of photosynthesis and L-glucose rarely seen in nature. Therefore, option (A) is correct.