What area of science does quantum mechanics primarily focus on?

Quantum mechanics primarily focuses on particle behavior at the atomic and subatomic levels. This area of science investigates the principles governing the interactions and properties of particles such as electrons, protons, and photons. Unlike classical physics, which deals with macroscopic phenomena and predictable behaviors, quantum mechanics reveals that particles can exhibit wave-like behavior and can exist in multiple states simultaneously due to superposition. This fundamental understanding of particle behavior has led to the development of numerous technologies, including semiconductors and quantum computing, making it a pivotal field within physics. The other choices represent different branches of science unrelated to the specific phenomena studied in quantum mechanics.