Which frequency range makes pure filtering easiest with a given filter type?

The correct choice related to the frequency range that makes pure filtering easiest with a given filter type is high frequencies. High-frequency signals tend to have shorter wavelengths, which allows filters designed to operate at these frequencies to be more effective in distinguishing between desired signals and unwanted noise.

Filters, particularly those designed for high frequencies, can be finely tuned to respond to specific frequency components while effectively rejecting others. This is due to the relatively straightforward implementation of components like inductors and capacitors at higher frequencies, which results in sharper and more distinct cutoff characteristics.

In contrast, at lower frequencies, filters may struggle with the longer wavelengths and could inadvertently affect a broader range of frequencies, making it more challenging to achieve pure filtering. Thus, the high-frequency range is where the design and implementation of filters can be optimized for clarity and precision in handling specific signals.