Who first proposed the atomic theory of matter? What does it suggest?

Given below are two statements :
Statement-$I$: Sublimation is used for the separation and purification of compounds with low melting point.
Statement-$II$: The boiling point of a liquid increases as the external pressure is reduced.
In the light of the above statements, choose the correct answer from the options given below :

What are the macroscopic properties of matter?

Which is the best method to separate a mixture of benzoic acid and naphthalene?

What are the fundamental components of matter?

Define the nature of matter.