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.

C) the twentieth-century had the most tornados on record