Answer :

Option (a) cannot be the base of a pyramid because pyramid is a polyhedron and its base is polygon.


(b) Circle cannot be the base of a pyramid because pyramid is a polyhedron and its base is polygon.


(c) Octagon can be the base of a pyramid because it has a polygon as a base and lateral faces are triangle.


(d) Oval cannot be the base of a pyramid because pyramid is a polyhedron and its base is polygon

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