Which of the following rivers form the 'Sunderban Delta'?

The Sunderban Delta, the world's largest delta, is formed by the rivers Ganga and Brahmaputra (along with the Meghna) as they empty into the Bay of Bengal. The Narmada and Tapi flow into the Arabian Sea forming estuaries, not deltas. The Mahanadi, Godavari, Krishna, and Kaveri form their own deltas on the eastern coast but not the Sunderbans.