challenge: What was the primary focus of the negotiations mentioned in the context of the book 'Not One Inch'?
  
  A. The dissolution of the Warsaw Pact and the expansion of NATO
  B. The relocation of NATO and Warsaw Pact forces to separate countries
  C. The establishment of a new international border between East and West Germany
  D. The reunification of Germany and the co-location of NATO and Warsaw Pact forces
  Answer: 