Answer:
Option B, Chemical changes are the result of different atomic combinations.
Step-by-step 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