Which mechanism do sponges possess that makes a predator think twice before attacking it?

the mechanism that sponge possesses that makes predator think twice before attacking it is: They produce toxins that make them poisonous. On a certain time, sponge will produce toxins that could disrupt the metabolism of any organisms that dare to consume them. Most predators will be able to detect this toxin through their sense of smells which make them rather to avoid the sponge

The answer would be c