John dalton believed that: atoms are made of mostly empty space. chemical changes are the result of different atomic combinations. violent chemical reactions can divide atoms into smaller particles. all of the above.

Option B,  Chemical changes are the result of different atomic combinations.

Explanation:

According to Dalton , all chemical reaction involves combination of atom of same elements or combination of atoms of different elements to form a chemically different compound.

Thus, all Chemical compounds consists of either similar or different atoms in different proportion .

Dalton was not sure about particles smaller than atom , hence option A and C are not valid in case of Dalton's theory.

Hence, option B is correct