The correct answer is Ohm (Ω) (option D). Resistance, a fundamental property in electricity, is measured in ohms (Ω). This unit is named after the German physicist Georg Simon Ohm, who extensively studied electrical circuits and formulated Ohm’s law. Resistance represents how much a material or device impedes the flow of electric current. It is essential in designing circuits to control current flow and manage power dissipation. The ohm is universally recognized as the unit for resistance in the International System of Units (SI), providing a standardized measure across scientific and engineering disciplines. Understanding resistance is fundamental for optimizing the performance of electronic components, designing efficient electrical networks, and ensuring the safe operation of electrical devices by controlling current levels appropriately.