Sentence Correction

210. 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 character a miniature calligraphic composition inside their

OA is '[spoiler]A'
Why the answer is 'each' and not 'every'[/spoiler]

hello,
The focus here is not EACH or EVERY.

Focus here is Singular/Plural form. Please remember "Each", "Every" and their derivatives are Singular.

Thus, here, should be followed by "It"

Pahwa is right. Since each and every are so interchangeable, the best way to look at the sentence is for the agreement of the pronoun. Getting that right immediately isolates two answers.