Which sentence is correctly hyphenated? a) she decided to take the long-winding road b) a tall-dark man approached the entrance with determination c)the twentieth-century had the most tornados on record d) the hikers spotted a red-tailed pheasant

D. The hikers spotted a red-tailed pheasant.  

Red modifies tail, not pheasant because the hikers spotted a pheasant with a red tail, not a red pheasant with a tail. When "a noun + an adjective" becomes a compound adjective, you need to use a hyphen.

both are bitter over their mistake