Which of the following best describes the study of chemistry?

The study of chemistry is best described as the composition, structure, and properties of matter. Chemistry is fundamentally concerned with understanding what substances are made of (composition), how they are organized and arranged (structure), and how they behave and interact with one another (properties). This broad definition encompasses many areas of the discipline, including organic chemistry, inorganic chemistry, physical chemistry, and analytical chemistry, all of which delve into the nature of substances and their transformations.

In contrast, while the formulation of new substances is a significant aspect of chemistry, it does not encompass the entirety of what chemistry studies. Similarly, the interaction of biological systems relates more to biochemistry, a specific branch of chemistry that focuses on the chemical processes within and related to living organisms. The study of atomic energy, while linked to chemistry through the examination of atomic structure and reactions, is a more specialized area that primarily pertains to nuclear chemistry and physics. Thus, the correct answer captures the broader essence of chemistry as a science dedicated to understanding matter in all its forms and behaviors.