What was ironic about the inscription of Auschwitz' iron gate? |

It meant "work makes you free." The inscription was used by the Nazis to give the Jewish prisoners false hope that if they will work hard, they will eventually earn their freedom.

Explanation:

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as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.