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Blue whales are gentle giants and the largest animals in the world, but their food consists of tiny, shrimp-like animals called krill. These gentle giants can eat up to 12,000 pounds of krill a day."



How should the shortened excerpt be punctuated?

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"Blue whales, can eat up to 12,000 pounds of krill a day."
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"Blue whales: can eat up to 12,000 pounds of krill a day."
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"Blue whales—can eat up to 12,000 pounds of krill a day."
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"Blue whales . . . can eat up to 12,000 pounds of krill a day."