Can someone please help me no one ever responds to my question and I need the correct answer. I believe the answer is C but i'm not sure

What type of evidence could marine biologists use to convince policy makers to protect a specific coral reef?

Past data to show that the health of the reef was increasing over time
Past data to show that the health of the reef was remaining stable over time
Collected data on the coral reef to show that the health of the reef was declining over time
Collected data on reefs all around the world to show that the health of the reef was increasing over time