Answer : The correct option is, (B) Two compounds with same chemical formula but different orientation.
Explanation :
Stereoisomers : It is defined as the isomers which have the same bond connectivity but different arrangement of the groups or the atoms in the space.
That means the two compounds have the same chemical formula, same bond connectivity and same space but different orientation.
Hence, the stereoisomers are the two compounds with same chemical formula but different orientation.