Answer:
D. river current exceeds the oceanic current
Explanation:
The bird's foot delta type of deltas occur at places where the river current exceeds the oceanic current. This is the case with the Mississippi River and its delta. The current of the Mississippi River exceeds the currents from the Gulf of Mexico which are very weak. Because the currents of the Gulf of Mexico are very weak, the river is depositing lot of sediments at its final part. The accumulation of this sediment results in splitting up of the river in a triangular manner at its delta, giving it an appearance of the bird's foot, thus the name bird's foot delta.
