Step 1: Identify the location of each river.
- Río Magdalena → Located in Colombia, one of the principal rivers of the country.
- Río Ebro → Found in Spain, flows into the Mediterranean Sea.
- Río Plata → Basin located between Argentina, Paraguay, and Uruguay; primarily associated with Argentina.
- Río São Francisco → Located in Brazil, an important river for hydroelectric power and irrigation.
Step 2: Match accordingly.
A-II, B-I, C-IV, D-III.
Step 3: Verification.
All rivers correspond correctly with their countries of flow.
Step 4: Conclusion.
Hence, the correct answer is (2) A-II, B-I, C-IV, D-III.