The correct answer is option 4, sting. In scorpions, the venom or poison is primarily present in their stingers, located at the end of their tails. Scorpions use their stingers as a defense mechanism and to immobilize their prey. When a scorpion feels threatened, it will arch its tail and extend its stinger forward to deliver venom to its attacker. The venom of a scorpion contains various toxic components that can vary in potency depending on the species. It is used to paralyze or kill their prey and to protect themselves from predators. So, it is the sting of a scorpion that contains the poison, not any of its other body parts listed in the options.