Answer:
Pentagonal pyramid
Explanation:
Given:
Cone
Cylinder
Square pyramid
Pentagonal pyramid
Of the above, Cone and Cylinder have infinite planes of symmetry while Square pyramid has 4 planes of symmetry. Hence correct option is Pentagonal pyramid.
As Pentagonal pyramid have 5 equilateral triangles creating a pyramid on its pentagonal base. It has 5 planes of symmetry!