When it comes to identifying objective summaries, we can select the following option as the one that objectively summarizes the passage:
D. Biomass is a material derived from vegetation. The U.S. Department of Energy promotes biomass as a source of energy because it is sustainable and available nationally.
As the name suggests, an objective summary should provide an unbiased shorter version of a text. Being objective means being free of opinions, impressions, or biases.
That is why we can eliminate options A, B, and C. The use of words such as "attractive," "promising," and "positive" show that the author of the summary is expressing his opinions and impressions when it comes to the topic.
The only summary that is completely objective is the one provided in option D. There are no words that show judgment or bias in it.
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