Answer:
Option (B)
Step-by-step explanation:
A delta is usually defined as a contrasting geological landform that forms the mouth of a river channel, and where there is an abundant supply of sand, clay and silt-size particles. The deltas are the places where the river finally mixes with seas or oceans. These areas form a flat lowland that is comprised of highly fertile soil and is suitable to carry out agricultural activities.
For example, the Mississippi River forms a delta when it flows into the Gulf of Mexico and is surrounded by rich and fertile soil.
Thus, the correct answer is option (B).