The answer is A - Myanmar (formerly Burma). It's the largest river in this territory (1348 miles long) and also the most curcial waterway for commercial use. Sometimes it's also called "The Road to Mandalay".
The Irrawaddy River is to Myanmar as the Mekong River is to Vietnam. Both rivers are essential waterways for their respective countries, playing vital roles in trade and agriculture. Therefore, the answer is A - Myanmar.
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