Volume of Solid Figures

Which of the three pools in the picture occupies more space and why?

Prism is a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.

A cylinder is a solid plane figure with two identical flat ends that are circular and one curved side. It has the same cross section from one end to the other. 

Pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is conic solid with polygonal base. A regular pyramid has a regular polygon base and is usually implied to be a right pyramid.

Cone is a distinctive three-dimensional geometric figure that has a flat surface and a curved surface pointed towards the top. The pointed end of the cone is called the vertex, whereas the flat surface is called the base. 

Sphere is a geometrical object in three dimensional space, that is, the surface of a ball. Like a circle in two dimensional space, a sphere is defined mathematically as the set of points that are all at the same distance (r) from a given point in a three dimensional space. These are also referred to as the radius and center of the sphere respectively.