After careful consideration your answer is...
Leucippus and Democritus
*Hope I helped*
~Alanna~
Answer: Option (C) is the correct answer.
Explanation:
When chemical composition of a substance is not changing in a chemical reaction then it is known as a physical change.
For example, when water change state, from ice to steam then it means solid state is changing into gaseous state.
Therefore, it is a physical change.
And, a reaction which causes change in chemical composition is known as a chemical change.
For example, 
Thus, we can conclude that we can see water change state, from ice to steam. This is a physical change in matter.
Answer:
The difference in the number of protons and neutrons in atoms account for many of the different properties of elements.
Solid -(s)
liquid - (l)
gas - (g)
aqueous - (aq)