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While some economists propose that agricultural land be used to help solve the energy crisis by converting arable land from foods to bio-fuel, a majority of analysts believe that bio-fuels should be produced only from non-food crops, whose use will impact the environment less.
This answer choice is stylistically flawed. The phrase the use of which will have a lesser impact is wordy and redundant. Look for an answer choice that is more concise.
This answer choice is stylistically flawed.
It unnecessarily makes use of the conditional (if used) within the modifying clause having less of an impact. This construction also creates ambiguity, as it is not clear what if used refers to - the environment or non-food crops.
Similarly, the use of the participle clause having less of an impact is ambiguous as it could refer to analysts, bio-fuels, or non-food crops.
This answer choice is grammatically incorrect. The pronoun its does not agree with the plural noun it is meant to refer to - non-food crops.
This answer choice is stylistically flawed. The use of the pronoun them is ambiguous, as it could refer to analysts, bio-fuels, or non-food crops.
In addition, the use of the preposition with is also awkward and confusing, as it is not clear what with refers to.
This answer choice makes correct and unambiguous use of the possessive relative pronoun whose to refer to the use of non-food crops:
non-food crops' use == use of non-food crops --> non-food crops whose use
This answer choice also concisely expresses the meaning of the sentence by using the verb impact and the adverb less.