The Brahmaputra, Irrawady and Mekong rivers originate in Tibet and flow through narrow and parallel mountain ranges in their upper reaches: Of these rivers, Brahmaputra makes a "U" turn in its course to flow into India. This "U" turn is due to
A. Uplift of folded Himalayan series
B. Syntaxial bending of geologically young Himalayas
C. Geo-tectonic disturbance in the tertiary folded mountain chains
D. Both A and B above
Answer: Option D

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