Which of the following statements best describes the unique physiographic characteristic of the Brahmaputra Plain that distinguishes it from the Ganga Plain?

Options:

• A: It is dominated by extensive calcareous clay deposits known as Kankar.
• B: It is characterized by a steep gradient leading to the complete absence of riverine islands.
• C: It is highly prone to river channel shifting and contains numerous river island formations like Majuli due to low gradient and high sediment load.
• D: It is primarily composed of older alluvium forming high terraces that are never flooded.

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