**A**

**B**

**C**

**D**

Three of the four Graphs given above are isomorphic to each other. Isomorphic Graphs are equivalent to each other. The Graph is called Petersen Graph which is very important in Graph Theory such that entire text books are dedicated for discussing them.

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**The Odd one is C. The Graphs A, B, and D are isomorphic and called Petersen Graph.**

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