With reference to the regional divisions of the Ganga Plain, consider the following statements: 1. The Upper Ganga Plain is characterized by a high concentration of active floodplains (Khadar) compared to the Lower Ganga Plain. 2. The Middle Ganga Plain, which includes parts of Bihar, is a transitional zone with a very low gradient, making it highly prone to shifting river courses. 3. The Lower Ganga Plain is dominated by deltaic formations and is characterized by the presence of 'Bils' and 'Chars'. Which of the statements given above are correct?

Options:

• A: 1 and 2 only
• B: 2 and 3 only
• C: 1 and 3 only
• D: 1, 2 and 3

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