Match each author to their key contribution to International Relations theory.
| Author | Contribution |
|---|---|
| A) Hans Morgenthau | 1) World-Systems Theory |
| B) Immanuel Wallerstein | 2) The Twenty Years' Crisis |
| C) E.H. Carr | 3) Politics Among Nations |
| D) Robert Keohane | 4) After Hegemony |
1
A-3, B-1, C-2, D-4
2
A-2, B-3, C-4, D-1
3
A-4, B-1, C-2, D-3
4
A-1, B-2, C-3, D-4
5
Question Not Attempted