Consider the following pairs : River : Flows into 1. Mekong : Andaman Sea 2. Thames : Irish Sea 3. Volga : Caspian Sea 4. Zambezi : Indian Ocean Which of the pairs given above is/are correctly matched ?

Option (c) is correct because the Volga, Europe's longest river, drains into the landlocked Caspian Sea, and the Zambezi flows through southern Africa into the Indian Ocean. Pair 1 is the most common distractor; the Mekong actually flows into the South China Sea (not the Andaman Sea), while the Thames (Pair 2) empties into the North Sea. This question tests the core concept of global drainage patterns and the geographical outlets of major international rivers.