I believe that the answer to this question is:
Sudden as hungry wolves the kids purloinOr lambs, which haply some unheeding swainHath left to roam at large the mountains wild
This is because a simile uses the words like or as.
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The correct answer is b.
Hardly, as an adverb means "just", hardly, in this context is acting as a limiting modifier of the word ever. <em>Hardly ever</em> means very occasionally. We may use words like it to emphasize how infrequently an action takes place. You should note also that there could be other ways to give quite the same meaning, like when you use <em>rarely</em> or <em>seldom</em>, but, hardly ever has also a <u>negative</u> connotation.
Turbulent. You know how turbulence tosses the plane around in the air? the water was rough so she thought it would be dangerous <span />