Which of the following best supports the idea that the melting of glaciers in Antarctica is a global environmental threat?

AThe melting of glaciers can cause sea levels on Earth to fall.

BThe melting of glaciers can change ecosystems in Antarctica.

CThe melting of glaciers can harm animal populations in Antarctica.

DThe melting of glaciers can cause coastal flooding on other continents.

I think it is A because it emphasizes that the whole Earth will be affected, while C shows that it is an environmental threat.