The best revision that includes more precise language and vocabulary is:
A. An octopus can almost instantaneously match the colors, patterns, and textures of its surroundings. Predators such as dolphins, eels, and sharks swim by without even noticing them!
This option uses specific terminology related to the octopus's ability to blend in, effectively conveys the speed of its camouflage, and names specific predators. The language is clear and precise, improving upon the original vague phrasing.