The answer is option D. Present perfect. The present perfect tense indicates an action that started in the past and is still happening now.
For example:
-I have been answering these questions since last weekend.
-We have been living here for 10 years.
She is speaking about times in which man becomes most desperate that in times where one is attacked, hurt or in a position from which something awful may occur they become their most powerful. This can be related to times where you struggled and found strength within yourself to do what you thought was impossible.
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Figurative language uses words or expressions with a meaning that is different from the literal interpretation.