单项选择题
Why are Chinese paintings seldom framed?
A.Because Chinese people do not find frames aesthetically beautiful.
B.Because wood was expensive in China, and only rich people could afford buying expensive wooden frames.
C.Because a painting frame had some religious meaning and only the emperor had a right to use them.
D.Because in China paintings usually are rolled into scrolls, and one can't roll a painting into a scroll if it is inside a hard frame.