The correct option is B Horse
In variable protective resemblance, an animal such as chameleon, garden lizard, flatfish, squid or octopus changes its skin pattern and color using special chromatophore cells to resemble whatever background it is currently resting on. This color changing power is present in pisces, amphibians and reptiles but not in mammals and aves.
Horse, being a mammal, does not possess this color changing ability.
Thus, the correct answer is option B.