Answer:
A. Killer whales (a common predator of Adelie penguins) have appeared in waters around Anvers Island.
Step-by-step explanation:
In spite of the lack of food and unfavorable living conditions, the colony of Adelie penguins has emigrated onto neighboring islands to avoid the killer whales noticed around Anvers island in Antarctica. As a consequence, the penguins' survival instinct has caused them to eventually move to other islands, disregarding of their habitats.