What does a multimeter measure?

A multimeter is a versatile instrument used to measure various electrical properties in circuits. The correct answer encompasses the three primary functions that a multimeter can perform: measuring voltage, current, and resistance.

When measuring voltage, the multimeter can assess both alternating current (AC) and direct current (DC) voltages, providing essential information for diagnosing electrical problems. Current measurement can also vary, as multimeters can often measure both AC and DC current, making them useful for different types of electrical circuits. Lastly, the ability to measure resistance allows users to determine whether a circuit component, such as a resistor, is functioning correctly or if there is a short circuit.

While the other choices may seem relevant, they do not cover the full spectrum of what a multimeter is capable of. For example, the second option focused solely on resistance and continuity, which is only part of the multimeter's functions, while measuring power and energy consumption specifically (as mentioned in another choice) is typically outside the scope of standard multimeter capabilities. Thus, a multimeter's comprehensive ability to measure voltage, current, and resistance solidifies option C as the correct answer.