In my opinion the question is poorly designed.
In the OA B "which" modifies "water" and is not correct as it should refer to "the algae virtue".
So I marked E because I supposed that the author forgot the "," before allowing
In the OA B "which" modifies "water" and is not correct as it should refer to "the algae virtue".
So I marked E because I supposed that the author forgot the "," before allowing



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