It isn't simile, because there is no comparison to anything, and it isn't ironic.
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.
It is true that the history of the English language is closely linked with Latin borrowings, as evidenced by the great number of Latin roots present in English even today.
A very large percentage of the English language and words actually come from Latin.
D. Ecosystems
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It refers to the system by which people were physically labeled in concentration camps during the Holocaust.
