Answer:
Aposematic coloration
Step-by-step explanation:
From the example illustrated in the question, the warning coloration in the butterflies is an aposematic coloration.
An aposematic coloration is a warning coloration exhibited by certain organisms (preys) to serve as a warning to potential predators from harming or killing it. This kind of defense mechanism could make the prey not easy to be eaten as a result of the sharp colors they exhibit making them repulsive. It sends a signal to the predators that they might be harmful to eat. An example of such animal is the Monarch butterflies.