Answer: D) Ivan Ilyich feels lonely, and his childhood memories cause him more pain.
Explanation: In the given excerpt from Leo Tolstoy's "The Death of Ivan Ilyich" we can see that Ivan Ilyich feels incredible lonely ("Latterly during the loneliness in which he found himself as he lay facing the back of the sofa") and because of that he lived in the past, specifically in his childhood memories ("during that terrible loneliness Ivan Ilyich had lived only in memories of the past") this memories, instead of comfort him, bring him more pain ("No, I mustn't thing of that....It is too painful," Ivan Ilyich said to himself). So the correct answer is option D.