Context: Read the passage. Then answer the question below.

Sea ice in the Arctic is a resting place for many mammals. Species such as ringed seals, walruses, and polar bears rest on sea ice when they are not hunting in the water below.
These mammals are adapted to extremely cold temperatures. Ringed seals and walruses grow thick layers of fat, called blubber, under their skin. Blubber protects their bodies from the frigid temperatures. Polar bears eat ringed seals and walruses. The blubber in these types of prey is a good energy source for polar bears.
Figure: walruses resting on sea ice.
Which of the following best describes a population on sea ice in the Arctic?
A. a group of ringed seals
B. the walruses and the sea ice
C. the polar bears and the walruses
Answer with the option's letter from the given choices directly.

A