Which component is primarily responsible for blocking low-frequency AC voltage in a distribution amplifier?

The component that is primarily responsible for blocking low-frequency AC voltage in a distribution amplifier is the capacitor. Capacitors have the unique ability to allow alternating current (AC) to pass through while blocking direct current (DC) and low-frequency signals. This functionality is due to their reactive nature, which changes with frequency. At low frequencies, the capacitive reactance is high, effectively preventing low-frequency signals from getting through, while allowing higher frequency signals to pass more easily.

In applications like distribution amplifiers, capacitors are utilized to isolate different stages of the amplifier and to ensure that only the desired frequency range is amplified. This helps in reducing interference from low-frequency noise that can affect the quality of the output signal. Hence, in the context of the question, the selection of a capacitor as the correct answer highlights its crucial role in maintaining signal integrity by blocking unwanted low-frequency components.