Determine which stage of Knapp's developmental model Angelina and Brad are in based on the following clues: They are arguing less than they once did, which may seem like a good thing. But they just don't have the energy to try to work on their differences anymore. While they still spend time together, their communication lacks the quality it once had. A. Differentiating B. Intensifying C. Stagnating D. Circumscribing E. Avoiding