What best describes the operation of a high-pass filter?

A high-pass filter is designed specifically to allow high frequencies to pass through while attenuating (reducing the amplitude of) lower frequencies. This operation is essential in various applications, such as audio processing, communications, and signal processing, where it may be necessary to isolate higher-frequency signals from a mix of frequencies.

The filter’s design typically includes components such as capacitors and resistors, configured to create a cutoff frequency. Frequencies above this cutoff are allowed to pass with minimal loss, whereas frequencies below this threshold are significantly weakened. This characteristic makes high-pass filters valuable for eliminating unwanted lower frequency noise or interference from a signal, ensuring that only the desired high-frequency information is transmitted or processed.

In its operation, the high-pass filter thus serves to enhance the clarity of signals, making option C the correct description of its function.