Options available:
a. streamlined body = It means that the body shape will allow swimming in water with less drag. A sea otter's body is streamlined.
b. webbed hands and feet = The sea otter has webbed hands and feet shown in the picture above. They use it to efficiently swim in the water.
c. body covered in thick fur = Sea otters have thick and almost waterproof fur. The thick fur also helps them from losing internal body heat.
d. breathing apparatus on the top of the head = Not present in the body of a sea otter. The sea otter has a nose as breathing apparatus situated in its snout.
ANSWER: D. breathing apparatus on the top of the head