OG 5.6 Q# 15

Chinese, the most ancient of living writing systems, consists of tens of thousands of ideographic characters, each character a miniature calligraphic composition inside its own square frame.

A. each character a miniature calligraphic composition inside its
B. all the characters a miniature calligraphic composition inside their
C. all the characters a miniature calligraphic composition inside its
D. every character a miniature calligraphic composition inside their
E. each characters miniature calligraphic composition inside their

OA is A

Can anyone please explain the answer?