Select the correct answer.

Read the following paragraph:

"Like other marine mammals, whales get oxygen from the air, not the water. Whales have a blowhole on the top of their heads to inhale and exhale oxygen from the water's surface. Another feature they share with other mammals is the way they produce young. Whale calves stay inside their mothers until they are born."

Which topic sentence best introduces the paragraph?

A. Although whales live in the water, they are not so different from other mammals.
B. Whales do not lay eggs to give birth to their babies.
C. Some whales may have teeth while others have baleen plates that help filter food.
D. Whales are the largest animals on Earth today.
E. Whales make sounds to communicate with one another.