These are  stereoisomers so option b.
constitutional isomers are structural isomers who have specific type of isomers that share the same molecular formula but different bonding structure and patterns. To identify a constitutional isomer the easy way is to count the number of carbon and the degree.
Isomers that have same composition but have different orientation in space is known as stereoisomers. it is of two types diastereomers and enantiomers.
the non-superimposable mirror images are formed by enantiomers.
diastereomers are not mirror images but they are non-superimposable
Here in this figure the given are stereoisomers and it is diastereomer.
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this question was incomplete and there was no figure. i gave attached a fig accordingly answered the question.
