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B
Rectrices
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C
Prepatagium
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D
Postpatagium
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Solution
The correct option is B Rectrices The tail feathers which are slightly elongated are used to provide stability and control. They are referred to collectively as rectrices and are used for steering during flight. The rectrices are connected to each other by ligaments, with only the innermost feathers attaching directly to the tailbone. Thus, the correct answer is option B.