A passage about penguins says: 'Penguins cannot fly, but they are excellent swimmers. Their wings act like flippers in the water. They can dive deep to catch fish.' What detail supports the idea that penguins are well suited to water?
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A
Penguins cannot fly like other birds.
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B
Penguin wings work like flippers in the water.
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C
Penguins eat fish for their diet.
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D
Penguins live in cold climates.