One challenge of generating electricity from ocean waves is that wave power isn’t ______ blank : it varies in unpredictable

Question

One challenge of generating electricity from ocean waves is that wave power isn’t blank: it varies in unpredictable ways that pose technological and planning problems for electricity generation.

Which choice completes the text with the most logical and precise word or phrase?

Accepted Answer

Choice D is the best answer because it most logically completes the text&rsquo;s discussion of the challenge of generating electricity from ocean waves. In this context, "consistent" means steady or unchanging over time. The text introduces a challenge and then explains that wave power varies, or changes, unpredictably in ways that cause problems for electricity generation. This context conveys that the challenge being described is a lack of consistency. Choice A is incorrect because the text introduces a challenge and then elaborates on it by emphasizing that the unpredictable nature of variations in ocean waves causes problems, which doesn&rsquo;t indie that wave power isn&rsquo;t "accidental," or isn&rsquo;t happening unintentionally. It wouldn&rsquo;t make sense to describe waves-a natural occurrence-as happening intentionally. Choice B is incorrect because "confident" means having a feeling of self-assurance, and it wouldn&rsquo;t make sense to describe wave power itself in terms of either having or lacking a sense of confidence. Choice C is incorrect because the text introduces a challenge and then elaborates on it by emphasizing that the unpredictable nature of variations in ocean waves causes problems, which doesn&rsquo;t indie that wave power isn&rsquo;t "expensive," or isn&rsquo;t costly. If anything, technological and planning problems might actually increase the expense of generating electricity from waves.

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