Who proposed the atomic theory?

Q. Who proposed the atomic theory?
A. John Dalton.
B. Robert Millikan.
C. J. J. Thomson.
D. Neils Bohr.
Answer: Robert Millikan.

A. John Dalton.
B. Robert Millikan.
C. J. J. Thomson.
D. Neils Bohr.
Answer: Robert Millikan.