Match the following spatial interaction theorists with their contributions:
| A. Edward Ullman | 1) Concept of Transferability, Intervening Opportunity, and Complementarity |
| B. M. E. Hurst | 3) Principles of spatial organization and accessibility |
| C. William J. Reilly | 2) Development of the Law of Retail Gravitation |
| D. J. H. von Thünen | 4) Model of Agricultural Land Use |
1
A-2, B-1, C-3, D-4
2
A-1, B-3, C-2, D-4
3
A-1, B-2, C-4, D-3
4
A-4, B-2, C-1, D-3