The correct hyphenated sentence is option D: 'The hikers spotted a red-tailed pheasant.' This sentence properly uses the compound adjective 'red-tailed' to describe the pheasant. The other options either do not require hyphenation or are incorrectly hyphenated.
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The correct sentence that is properly hyphenated is option OD: 'The hikers spotted a red-tailed pheasant.' This sentence correctly identifies 'red-tailed' as a compound adjective describing the pheasant. Other options either use incorrect hyphenation or do not require it at all. ;