Explanation
$$\textbf{Step - 1: Define Polyhedron}$$
$$\text{A polyhedron is a three dimensional shape with flat polygonal faces, straight edges}$$
$$\text{ and sharp corners or vertices.}$$
$$\textbf{Step - 2: Eliminate options}$$
$$\text{From the above options,}$$
$$\text{Cones, spheres, and cylinders are non-polyhedrons}$$
$$\text{Because their sides are not polygons and they have curved surfaces.}$$
$$\textbf{Hence , option(C) is correct, cube is a polyhedron.}$$
$$\text{ and sharp corners or vertices}$$
$$\text{From the above options, all except option (D) is not a polyhedron, because it is a cone.}$$
$$\textbf{Hence , option(D) is correct, It is not a polyhedron.}$$
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