Context: Crown-of-thorns sea stars 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 skin of the  is adapted to ward off predators.
Figure: crown-of-thorns sea star.
Which animal's skin is better adapted as a warning sign to ward off predators?
A. sharpnose-puffer
B. gray tree frog
From the given choices, select the correct answer and reply with the letter of the chosen option.

A