The Someshwar Hills region in West Champaran exhibits a distinct "Tropical Moist Deciduous" character with high biodiversity. Which of the following combinations of factors is primarily responsible for this unique phytogeographical feature?

Options:

• A: High altitude above 2000 meters, sub-zero winter temperatures, and podzolic soils.
• B: Low annual rainfall (under 80 cm), high wind velocity, and saline-alkaline soils.
• C: Moderate rainfall (100 cm), flat alluvial plains, and heavy clay soils.
• D: High annual rainfall exceeding 140 cm, high relative humidity, and moisture-retaining clayey-loam Terai soils.

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