Which of the following is the largest delta in the world

a.Mahanadi Delta

b.Ganga-Brahmaputra Delta

c.Nile Delta

d.Godavari Delta

The Ganga-Brahmaputra Delta is the largest delta in the world → Option B.

The Ganga-Brahmaputra Delta, also called the Sundarban Delta, extends over 1,05,000 sq. km in India and Bangladesh. It is formed by the Ganga, Brahmaputra, and Meghna rivers before they enter the Bay of Bengal. This makes it the world’s largest and most fertile delta.

a. Mahanadi Delta — Incorrect.
The Mahanadi flows ~900 km through Chhattisgarh and Odisha before forming its delta on the Bay of Bengal. It’s regionally important but far smaller than the Ganga-Brahmaputra system.

b. Ganga-Brahmaputra Delta — Correct.
Also called the Sundarban/Bengal delta, it’s the largest delta in the world, formed by the Ganga, Brahmaputra and Meghna rivers, spanning much of Bangladesh and West Bengal (area ≈ 100,000 km²).

c. Nile Delta — Incorrect.
The Nile forms a large arcuate delta in Egypt (~20,000 km²), but it is smaller than the Ganga-Brahmaputra delta; sediment delivery to the coast has also reduced since the Aswan High Dam, accelerating erosion.

d. Godavari Delta — Incorrect.
The Godavari builds a fertile delta in Andhra Pradesh (part of the Krishna-Godavari “rice bowl”), yet its extent is well below that of the Ganga-Brahmaputra delta.
Encyclopedia Britannica

Note. The Okavango Delta in Botswana is often cited as the largest inland (endorheic) delta—distinct from ocean-draining deltas like the Ganga-Brahmaputra. It is not the world’s second-largest delta overall.