In Which of the Following Examples Has Communication Not Occurred

In which of the following examples has communication not occurred?

A) A bird signs from the top of a tree in its territory keeping other birds of the same species from trespassing.
B) A queen bee emits a chemical that keeps worker bees from becoming reproductive.
C) A waggle dancing bee feeds some of the nectar she is carrying to bees attending her dance;they now know what type of flowers she has visited.
D) A bird signs from the top of a tree in its territory attracting a female of the same species to it.
E) A bird gives an alarm call when a hawk approaches,but no other birds are in the area.