Why is the Ganga Brahmaputra delta formed?

Correct answer: Due to sediment deposition at the mouth

The direct answer is A, sediment deposition at the river mouth. A delta forms where a river enters a sea or lake, loses much of its speed, and can no longer carry all its load. Sand, silt, and clay settle and accumulate near the mouth. Repeated deposition may divide the river into distributaries and create a roughly triangular, fertile landform. Option A is correct because deposition is the essential process behind the Ganga-Brahmaputra delta. Option B, snow freezing on mountains, may affect river water supply but does not build a delta at the mouth. Option C, desert wind, is unrelated to the river’s mouth and cannot explain this delta. Option D, drying of the sea, is not the normal process; the delta grows mainly because river-borne sediment is deposited. Exam cue: river slows at its mouth, load settles, delta forms.