Match the variants of the Gravity Model with the specific adjustments made to the original model:
| A. Retail Gravity Model | 1) Incorporates importance of intervening opportunities |
| B. Population Potential Model | 2) Uses population potential accessibility to predict interaction |
| C. Huff Model | 3) Factors in the probability of consumers choosing competing retail locations |
| D. Modified Gravity Model | 4) Adjusts distance decay constants based on real-world empirical data |
1
A-4, B-2, C-3, D-1
2
A-4, B-1, C-2, D-3
3
A-3, B-2, C-1, D-4
4
A-2, B-3, C-4, D-1