According to Marcus Aurelius, a Roman Stoic

According to Marcus Aurelius, a Roman Stoic:

A) the universe should be regarded as an intelligent, living being.
B) all things are fundamentally composed of atoms.
C) there are four fundamental substances: earth, air, fire, and water.
D) philosophers should study cosmology, rather than the nature of man.
E) philosophers should study the nature of man, rather than cosmology.