Fact 1: Ants communicate with chemicals called pheromones. Fact 2: Pheromones are only found in insects. Given the two facts above, insects communicate with what?

Select from the following.
(a). wave in air;
(b). chemicals;
(c). Vibrates;
(d). Decibels;
(e). waves;
(f). speech;
(g). whistling;
(h). hand signals;
The answer is:
(b).