Match the following thinkers with their contributions to geography:
| Thinker | Contribution |
|---|---|
| a. Eratosthenes | 1. Developed regional approach |
| b. Alexander von Humboldt | 2. Developed systematic approach |
| c. Karl Ritter | 3. Coined the term Geography |
| d. Hartshorne | 4. Geography as study of areal differentiation |
1
a-1, b-2, c-3, d-4
2
a-2, b-1, c-4, d-3
3
a-4, b-3, c-1, d-2
4
a-3, b-2, c-1, d-4