Which of the following is an example of Antarctica's role in the earth's climate?

A The lightness of the polar oceans reflect heat from the Sun rather
than absorbing it.

B Antarctic ice acts as a shield, keeping the earth cool by reflecting the
Sun's heat rather than absorbing it.

C The ice-cold waters of the Southern Ocean restrict heat currents
from escaping to the rest of the world.

D The Antarctic ozone hole prevents all greenhouse gases from
penetrating the earth.