I wouls say A. Camouflage, because the definition of camouflage is hide or disguise the presence of a (person, animal, or object) by means of camouflage. (Verb)
Explanation: camouflage is the process of making someone or something less obvious with its environment. For example, when an animal comouflages it adapts its structure so as to look as similar as possible to its surroundings.
