The drainage pattern of North Bihar is predominantly characterized by 'antecedent' and 'dendritic' networks. Which of the following factors is primarily responsible for the high frequency of oxbow lakes (Maans and Chaurs) in this region?

Options:

• A: The tectonic upliftment of the southern Chhotanagpur plateau.
• B: The meandering nature of rivers carrying heavy silt loads across an extremely flat gradient.
• C: The high rate of wind erosion in the dry winter months.
• D: The construction of large-scale dams in the upper catchment areas of Nepal.

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