Read the sentence. the really important cause of the recent increase in renewable energy sources is new technology. revise the sentence to remove vague, empty words. a)delete “renewable.” b)delete “really.” c)delete “new.” d)delete “recent.”

B)Delete “really.”

Really is not needed in this sentence. It's already stated that the cause is important. Renewable is important because it specifies which type of energy sources. New is also important because technology is any tool that a person uses, so things like a wheel or a pencil could be considered technology, but they're not new. Recent is also an important word in this sentence because it specifies which increase in renewable energy sources is referred to.

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a is the indefinite article