Match the following inland waterways with their key exports:
| Inland Waterway | Key Export |
|---|---|
| A. Rhine Waterway | 1. Wheat, maize, timber, machinery |
| B. Danube Waterway | 2. Coal, cement, ores, industrial products |
| C. Volga Waterway | 3. Oil, gas, chemicals, grains |
| D. Great Lakes-St. Lawrence Seaway | 4. Automobiles, iron ore, grains |
1
A-3, B-2, C-1, D-4
2
A-2, B-1, C-3, D-4
3
A-4, B-2, C-3, D-1
4
A-1, B-3, C-2, D-4