In figure (i), the base and top both are the hexagonal polygons.
So, it is a hexagonal prism.
In figure (ii), only one vertex is available.
So, It is a cone,
In figure (iii), the base is square and rest four faces are equilateral triangles.
So, it is a square pyramid.
In figure (iv), the base is square and it has 6 faces and 8 vertices, So, it is a hexahedron (cube).
[Note Cube is also known as Hexahedron,]
Hence, the correct matching is as:
(i) → (b) (ii) → (d) (iii) → (c) (iv) → (a)