Read Riley's paragraph.(1) E-books, while reducing the need for paper and transportation, involve the environmental costs of manufacturing e-readers. (2) Including mining for rare earth metals and energy use. (3) Over time, frequent use of an e-reader can offset its environmental footprint, but for casual readers, the production and disposal of e-reader devices may negate these benefits.Which revision corrects an error?

Sentence 2, “Including mining for rare earth metals and energy use,” is a fragment because it does not express a complete thought. Joining it to sentence 1 with a comma makes it a phrase that gives examples of the environmental costs: “...manufacturing e-readers, including mining for rare earth metals and energy use.” So the correct revision is combining sentences 1 and 2 with a comma after “e-readers.”

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