अरबी समुद्र व बंगालच्या उपसागराला मिळणाऱ्या नद्यांचा ______ प्रमुख जलविभाजक आहे.

The correct answer is Option B (Western Ghats).

Key Points:
• The Western Ghats as India's Great Water Divide:
• The Western Ghats (Sahyadri Range) form a continuous, formidable mountain wall running roughly 1,600 km north-to-south parallel to India's western coastline.
• Continental Water Divide: It serves as the primary hydrological divide separating peninsular India's two major drainage basins:
• 1. Westward-flowing rivers: Short, swift rivers with steep gradients (e.g., Vaitarna, Ulhas, Savitri, Shastri, Mandovi, Sharavathi, Periyar) that drain directly into the Arabian Sea.
• 2. Eastward-flowing rivers: Long, mature river systems (e.g., Godavari, Krishna, Bhima, Tungabhadra, Cauvery) that originate on the eastern slopes of the Western Ghats and flow across the plateau into the Bay of Bengal.
• Key Takeaway: The Western Ghats act as the principal water divider between west-flowing (Arabian Sea) and east-flowing (Bay of Bengal) rivers.