Answer:
B. attenuation
Step-by-step explanation:
Attenuation is when your signal is lost or reduced as it travels from the transmitter to the receiver. Moisture is typically conductive, so it will cause a signal to be redirected, and the further the signal has to travel, the more attenuation (loss). The best path for the signal is a direct path from point A to point B, but conductive elements cause signals to "lose strength" because they take a different path before eventually reaching the destination.
Moisture is also a required component for corrosion, which is devastating to communication components, and another reason for signal attenuation.