B, bees tell their companions the direction of honey source by dancing, which belongs to the information transmission mode in animal and information exchange;
C, when the squid feels dangerous, the ink-jet juice is to confuse the enemy and escape, which belongs to defensive behavior and does not belong to information exchange;
D. Ants look for food through their peers' secretions, and animals communicate through smells, which belongs to information exchange.
So choose: C.