The given graph is Bipartite, 3-Regular graph on 8 vertices.
Also the given graph in the question is Hypercube graph on 8 vertices i.e. the given graph is $Q_3.$
Option C is $Q_3$, So option C is correct answer.
We can note that Graph in Option A,B,D have at least one vertex of degree 4, but in the given graph every vertex has degree 3, So, given graph is Not isomorphic to graph in option A,B,D.