One of the earliest known birds with a beak and contour feathers, Confuciusornis sanctus, with large clawlike "thumbs" on its wings, which probably helped them to climb up to a launching position for flight.
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Awith large clawlike "thumbs" on its wings, which probably helped them to
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Bwith large clawlike "thumbs" on their wings, which probably helped it to
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Chad large clawlike "thumbs" on its wings, which probably helped them
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Dhad large clawlike "thumbs" on its wings, probably to help it
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Ehad large clawlike "thumbs" on their wings, probably to help it
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正确答案: D