I am not very sure but I would probably use on the other hand or therefore.
The answer is: A. He reacts in a purely emotional way.
In the excerpt from "The Death of Ivan Ilyich," Tolstoy makes reference to judge Peter Ivanovich's affecting bevahior at his Ivan Ilych's funeral. He has been a close friend to Ivan, and knew he was going to die. In the passage, he responds to Ivan's wife with a sigh and is unable to finish his phrase, making both deeply moved emotionally.
