Which of the following are not causes of floods in the Brahmaputra river system? Choose the correct answer from the options given below:
1.Tributaries bring a huge quantity of water and silt, and heavy deposits of silt have raised the river bed.
2.Faulty agricultural practices.
3.Occasional earthquakes have changed the course of the river.
4.Broadness of the Brahmaputra valley.
5.Very high population pressure has forced people to live in flood prone areas.
A1 only
B2 only
C2 and 4 only
D5 only
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