Decide which of these sentences uses the hyphen correctly.（）

Decide which of these sentences uses the hyphen correctly.（）
A.He lived in the eighteenth-century.
B.He had always been interested in the eighteenth-century.
C.He was fascinated by eighteenth-century history.
D.I love eighteenth-century architecture.
正确答案：He was fascinated by eighteenth-century history.I love eighteenth-century architecture.