Read the excerpt from Article A. An adult sea otter's coat can contain up to 1 billion individual hairs! These hairs form a protective, waterproof layer, which traps air and provides insulation.

Select the best paraphrase of this excerpt.

a
The sea otter's coat has up to 1 billion hairs that form a protective coat.

b
The sea otter's plentiful hair protects and insulates the animal.

c
The hair forms a protective, waterproof layer that provides insulation.

d
A pup or baby sea otter has far fewer hairs to insulate and protect it.