What does the circular halo placed behind the head signify in the art of the Middle Ages

单项选择题Which of the following statements is NOT true about ;he characteristics of the art of the Middle Ages

A．It follows a kind of mathematics.
B．It's religious art, employing symbols to convey its meanings.
C．Art becomes an allegory, beyond each painting some profound meanings are hidden.
D．Art of the Middle Ages embodies the personality of the artist in a diffused way.
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