Read the sentence from Gulliver's Travels.

By the same computation, they provided me with sheets, blankets, and coverlets, tolerable enough for one who had been so long inured to hardships.

Based on the context provided by this sentence, which sentence correctly uses the word inured?

Gulliver's Travels

My brother continually inured me in the hope that I would accept his proposition; he didn't understand that begging wouldn't change my mind.
After several unsuccessful confrontations with her supervisor, Sandra became inured to his harsh treatment in order to keep her job.
Our PE teacher inured running into our daily routine to increase endurance; he felt that a consistent routine would be most beneficial for his students.
During my first few months as a new employee, I inured myself to the president of the company in order to gain additional favor.

When Gulliver said that "By the same computation, they provided me with sheets, blankets, and coverlets, tolerable enough for one who had been so long inured to hardships", he is implying that he had already become so accustomed to the hardships that he no longer finds it uncomfortable. The word "inured" means to get accustomed to the situation after suffering for so long, especially bad situations. So, in this sense, the sentence "After several unsuccessful confrontations with her supervisor, Sandra became inured to his harsh treatment in order to keep her job" correctly uses the word "inured" in the right way.