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

The ambitious scientific expedition's primary objective was to thoroughly document the unique ecosystem of the newly discovered island, which comprised of an unprecedented array of flora and fauna adapted to its extreme conditions.

A. (No change)
B. comprised an unprecedented array of flora and fauna adapted to its extreme conditions
C. consisted in an unprecedented array of flora and fauna adapted to its extreme conditions
D. was comprising an unprecedented array of flora and fauna adapted to its extreme conditions

1. Identification of Error: Idiomatic error involving the verb 'comprise'.
2. Grammatical Rule: The verb 'comprise' means 'to consist of' or 'to include'. Therefore, 'comprise of' is redundant and incorrect. The correct usage is either 'X comprises Y' or 'X consists of Y'.
3. Option Elimination:
A. Incorrect — 'comprised of' is an incorrect idiom.
B. Correct — 'comprised' is used transitively, meaning 'included' or 'consisted of', which is the correct idiomatic usage.
C. Incorrect — 'consisted in' means 'to have as its fundamental nature' or 'to be inherent in', which is not the intended meaning. The correct idiom for 'made up of' is 'consisted of'.
D. Incorrect — 'was comprising' uses the continuous tense, which is generally inappropriate for 'comprise' in this context, and it does not correct the underlying idiomatic error.