Which of the following statements is correct?

A$)$ Structure A and Structure B are constitutional isomers. All of their physical and chemical

properties are expected to be the different.

B$)$ Structure A and Structure B are enantiomers. In an achiral environment they have different

physical and chemical properties.

C$)$ Structure A and Structure B are enantiomers. In a chiral environment they have the same

physical and chemical properties.

D$)$ Structure A and Structure B are diastereomers. Some of their physical and chemical

properties expected to be different.

E$)$ Structure A and Structure B are conformers. Their physical and chemical properties are

expected to be the same.