Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

Matching the receiver's bandwidth to the transmitted signal's bandwidth ensures that all the desired signal is captured while rejecting as much background noise as possible. If the bandwidth is too wide, extra noise is let in, which degrades the signal-to-noise ratio (SNR). If the bandwidth is too narrow, part of the desired signal is cut off, making it distorted and harder to understand. Therefore, an optimal match provides the best possible signal-to-noise ratio. Options suggesting that bandwidth matching improves antenna impedance or minimizes power consumption are incorrect, as those factors are completely unrelated to receiver filtering and DSP settings.