Correct answer: C
Explanation
* Butterflies: Some butterfly species, like the Monarch butterfly, are poisonous. They consume milkweed during their larval stage, which makes them toxic to predators.
* Fish: Many fish species are poisonous, such as pufferfish, lionfish, and stonefish. They possess venom as a defense mechanism.
* Frogs: Poison dart frogs are a well-known example of poisonous frogs. Their skin secretes toxins that can be deadly.
_Therefore, all three groups have poisonous species._