Answer:
A. abilities
Step-by-step explanation:
The word "powers" as used in paragraphs 2, 3 and 4 actually means "abilities".
The passage reveals that some animals have "regenerative powers" that is "regenerative abilities". This means that those animals have abilities to regenerate some new from what was lost. The excerpt reveals that starfish have the regenerative ability to grow new arm when any of its arms is broken. It also reveals that even planaria that can be cut into pieces have the ability to grow into a new one from any of the pieces.
Regenerative power actually refer to the ability of restoring bringing something new out of something old. So, some animals that such abilities in them to do so.