Answer:
D) A Solid Sphere
Step-by-step explanation:
As per Dalton's atomic description he said that atom is not divisible and that is the smallest part of atom.
It has no net charge and it can not be divided further. So till Dalton's theory of atom electron and nucleons were not discovered.
So we can consider atom as a model of Solid sphere because similar to a solid sphere the atom is considered to be unique and not destructible.
So here correct answer will be
D) A Solid Sphere