Answer: 3. He reacts in a socially appropriate way.
In this excerpt, we learn that Peter Ivanovich tends to react in socially appropriate ways to emotional situations. The author tells us that Peter Ivanovich knew "what the right thing to do was." He also tells us that the actions he took were intended to achieve a particular result. At no point in the story does it seem like Peter Ivanovich took a step out of emotion, or acted spontaneous in any way. Instead, he acted the way he believed was socially appropriate to act.