Which of the Following Is True About Both China and Taiwan

Which of the following is true about both China and Taiwan?

A) Neither one is a member of the United Nations.
B) Both consider Taiwan to be the sovereign property of the communist government in Beijing.
C) Both now hold seats in the United Nations.
D) Neither was once ruled by the Nationalists, although both have official relationships with the United States.
E) Both were once ruled by the Nationalists, and both have official relationships with the United States.