Why are Narmada and Tapi considered different from the usual Peninsular flow direction?

Correct answer: They flow west into Arabian Sea while most large Peninsular rivers are east flowing

Direct answer: Option A is correct. Most major Peninsular rivers flow generally eastward because the Peninsular Plateau has an overall eastward slope toward the Bay of Bengal. Narmada and Tapi are important exceptions. They flow westward and enter the Arabian Sea. Their courses are associated with rift valleys and a westward regional slope, which helps explain their unusual direction. Option A states the relevant comparison accurately. Option B is wrong because neither river is a northern tributary of the Ganga; both belong to the west-flowing Peninsular river group. Option C is wrong because the Sundarbans are formed mainly by the Ganga-Brahmaputra-Meghna system, not by Narmada and Tapi. Option D is wrong because Tsangpo is the Tibetan name of the Brahmaputra, not of these rivers. Exam cue: pair Narmada and Tapi as west-flowing exceptions, while Godavari, Krishna and Kaveri are commonly remembered as east-flowing rivers.