Which of the following best describes signal attenuation?

Signal attenuation refers to the loss of signal strength as it travels through a medium, which can lead to a reduction in signal quality. This phenomenon occurs due to various factors such as distance, resistance in cables, and environmental conditions. When the signal weakens, it can result in degradation of the data being transmitted, making it more difficult for the receiver to accurately interpret the information. Therefore, option describing a reduction in signal quality aligns directly with the concept of signal attenuation.

In contrast, other options describe scenarios that are not consistent with attenuation; increases in signal strength, improvements in data transmission, or methods of enhancing performance indicate positive changes to the signal, which are not characteristics of signal attenuation.