What is fading?

What is fading?
A . Another signal source is producing energy on the channel in which you are trying to operate.
B . The desired signal reaches the receiving antenna via multiple paths, each of which has a different propagation delay and path loss.
C . A time-varying change in the path loss of a link with the time variance governed by the movement of objects in the environment, including the transmitter and receiver themselves.
D . A function of the frequency and should be provided in the cable specification by the vendor.
E . The minimum signal level for the receiver to be able to acceptably decode the information.
F . The time delay from the reception of the first instance of the signal until the last instance.

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Answer: C