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Choose the option that best corrects the grammatical or logical error in the underlined fragment.

The ancient text, a comprehensive philosophical treatise, is comprised of three distinct sections, each delving into a unique aspect of metaphysical inquiry.

A. (No change)
B. comprises three distinct sections, each delving into a unique aspect of metaphysical inquiry
C. consists in three distinct sections, each delving into a unique aspect of metaphysical inquiry
D. is composing of three distinct sections, each delving into a unique aspect of metaphysical inquiry

1. Identification of Error: Idiomatic error involving the verb 'comprise'.
2. Grammatical Rule: The verb 'comprise' means 'to consist of' or 'to include' and is generally used in the active voice without the preposition 'of'. The construction 'is comprised of' is considered redundant or incorrect in formal English; one should use 'is composed of', 'consists of', or the active 'comprises'.
3. Option Elimination:
A. Incorrect – uses the generally informal and redundant construction 'is comprised of'.
B. Correct – 'comprises' is used correctly in the active voice, meaning 'includes' or 'consists of', and is the most concise and precise correction.
C. Incorrect – 'consists in' is an incorrect idiom; the correct idiom is 'consists of'.
D. Incorrect – 'is composing of' is grammatically incorrect and semantically inappropriate for conveying that the text is made up of certain sections.