The answer would be D because A, B, and C are not relevant to her side of the argument. Those three letters really refer to the opposing side rather than her's. D is the only answer that seems logical for her to pick because it could be information that could be used on her side of the argument.
The right answer for the question that is being asked and shown above is that: "his approaching death." The topic that Ivan Ilyich is thinking about in this excerpt from Leo Tolstoy’s The Death of Ivan Ilyich is that <span>his approaching death</span>