The correct option is C 2 and 3 only
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Nearly 77 per cent of the drainage area consisting of the Ganga, the Brahmaputra,the Godavari, the Mahanadi, the Krishna, etc. is oriented towards the Bay of Bengal .
While close to 23 per cent comprising the Indus, the Narmada, the Tapi, the Mahi and the Periyar systems discharge their waters in the Arabian Sea.