Answer: B. It decreases the quality
Explanation: Signal noise is any unwanted or random variation in a signal that interferes with the transmission or reception of information. Noise can be caused by various factors, such as electrical interference, thermal fluctuations, atmospheric disturbances, or defects in the transmission medium.
In the case of the wave shown in the graph above, which appears to be an optical signal transmitted through a fiber optic cable, noise can affect the quality of the wave by distorting its shape, amplitude, frequency, or phase. This can result in errors or loss of data at the receiver end, as the original signal becomes harder to distinguish from the noise.
The quality of a signal can be measured by its signal-to-noise ratio (SNR), which is the ratio of the power of the signal to the power of the noise. A higher SNR means a better quality signal, while a lower SNR means a worse quality signal. Noise can reduce the SNR of a signal by adding unwanted variations to its power.
Therefore, noise decreases the quality of the wave shown in the graph above.
Hope this helps, and have a great day! =)