Answer :
C. because it could lead to an increase in ocean levels
Why would there be a concern with glaciers melting because of global warming? because it could lead to an increase in ocean levels
NOT:
A. because it could lead to the ocean currents warming up
B. because it could lead to an abundant amount of marine life
Why would there be a concern with glaciers melting because of global warming? because it could lead to an increase in ocean levels
NOT:
A. because it could lead to the ocean currents warming up
B. because it could lead to an abundant amount of marine life