4 Select the correct answer.
What is a central idea of the passage?
OA.
The narwhal has a single tooth, outside of its mouth, unlike other marine mammals, who have many teeth.
OB.
Whales are difficult to study because they are found in waters that are difficult to reach and covered in ice.
Oc.
The narwhal is a deep-water diving marine mammal with a single tooth, or tusk, for which it is best known.
OD.
Whales, such as the narwhal, that inhabit Arctic waters feed mainly during the spring and summer months.
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