A Male Cricket Creates Sounds That We Call "Chirps" by Rubbing

A male cricket creates sounds that we call "chirps" by rubbing one wing against the other. When is this considered an act of communication?

A) every time the cricket produces a chirp regardless of whether the signal is received by an organism
B) every time a member of its own species hears a chirp regardless of its response to the signal
C) every time a female member of its species hears a chirp and changes her behavior in response to the signal
D) every time the chirp is heard by some other organism that changes its behavior in response to the signal