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Answer

Correct Option is I-C; II-C; III-C

Solution:Among the given statements, all of them are grammatically incorrect and required certain changes.
(I)In this statement, for part C, “economical” must be replaced with “economic”.
(II)In this statement, for part C, “among” must be replaced with “across”. “across” is used when we want to suggest throughout or covering complete area. Whereas, “among” is used when the items are part of a group, or are not specifically named.
(III) In this statement, for part C, “have” must be replaced with “has”. Here, “ecosystem” is a singular noun, thus the complementary verb should be singular.

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