Context: Lionfish can release venom from the spines on their brightly colored bodies. The bright colors serve as a warning sign that the animal is venomous. The 's skin is adapted to ward off predators.
Figure: lionfish.
Which animal's skin is better adapted as a warning sign to ward off predators?
A. crown-of-thorns sea star
B. gray tree frog
Identify the correct option from the choices provided and respond with the letter of the correct option.

A