How is delta formed?
a. streams slow down when they meet the ocean and deposit sediment.
b. a strong storm causes the sand to wash into the ocean.
c. pollution causes deposits of sediment in the ocean.
d. waves carry large deposits of sediment into the shoreline.

The Delta is Formed by streams slow down when they meet the ocean and deposit sediment. Actually When a river reaches a lake or the sea the water slows down and loses the power to carry sediment . The sediment is dropped at the mouth of the river. Some rivers drop so much sediment that waves and tides can't carry it all away. It builds up in layers forming a delta. In Geographical Word: A river delta is a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or standing water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot transport away the supplied sediment.

The titanic is the answer