The answer is D) By the end of the story he is more philosophical than scientific, throughout all the story you can see how he starts by describing experiments that are mere facts and realities, even when he always had that uncertainty of the unknown, as he talks about his own death he becomes to the truth of their fragile existence
The righty answer is D, at the beginning the narrator mentions how enthusiastic they are about the study of anatomy and paid lip service to the mismatch in time and the perception of it. At the end, as death is inevitable, the narrator urgers the reader to enjoy their lives, because it will eventually come to an end.
I would say that the theme that Leo Tolstoy explores in this excerpt from The Death of Ivan Ilyich is that C) human mortality is inevitable, and it is important to live an authentic life.
