In chemistry, which of the following best describes the role of chemical theory and computation in understanding molecular systems?
A. Chemical theory and computation are used to predict molecular structures, reaction mechanisms, and properties by solving complex mathematical models and simulations.
B. Chemical theory and computation are primarily concerned with laboratory techniques for synthesizing compounds.
C. Chemical theory and computation focus solely on experimental observations without the use of computational models.
D. Chemical theory and computation are used only for qualitative analysis of chemical reactions and do not involve quantitative calculations.