The Hirakud Reservoir has faced a significant reduction in its active storage capacity over the decades. What is the primary driver of this ecological and operational challenge?

Options:

• A: High rate of evaporation due to the tropical climate of Odisha.
• B: Diversion of water to the Hasdeo Bango project upstream.
• C: Tectonic upliftment of the reservoir bed.
• D: Heavy soil erosion and deforestation in the upper catchment area of the Mahanadi River in Chhattisgarh.

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