Which of the following is most reasonably studied under the social sciences?

Political science is most reasonably studied under the social sciences because it specifically focuses on the theory and practice of politics, governance, and the analysis of political systems and behavior. It explores how power and resources are distributed, how policies are formulated, and how political institutions operate, all of which are fundamental aspects of human society and interactions.

In contrast, geometry, physics, and grammar fall outside the realm of social sciences. Geometry is a branch of mathematics that deals with the properties of space and shapes. Physics is a natural science that studies matter, energy, and the fundamental laws of the universe. Grammar, while integral to understanding language structure and usage, is typically associated with linguistics and language studies rather than the broader social context analyzed in social sciences. Therefore, political science stands out as the discipline that aligns with the study of human behavior, societal structures, and governance.