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The correct answer is option 1: 4-3-2-1.
Option 1 correctly arranges the tributaries of river Brahmaputra from west to east. Let`s dissect the options to understand why option 1 is correct and the others are incorrect:
- Option 2: 4-3-1-2
This option arranges the tributaries Tista, Subansiri, Lohit, and Dibang. However, it does not follow the order from west to east.
- Option 3: 3-4-2-1
This option arranges the tributaries Subansiri, Tista, Dibang, and Lohit. Again, it does not follow the order from west to east.
- Option 4: 2-4-3-1
This option arranges the tributaries Dibang, Tista, Subansiri, and Lohit. Similar to the previous options, it does not follow the correct order.
Therefore, option 1 is the correct answer as it correctly arranges the tributaries of river Brahmaputra from west to east, which is Tista, Subansiri, Dibang, and Lohit