runoff from sewage. deposition of sediment. an ancient glacier that passed through. an underground river flowing to the ocean.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A delta at the mouth of a river is the direct result of
Possibilities:
- runoff from sewage.
- deposition of sediment.
- an ancient glacier that passed through.
- an underground river flowing to the ocean.

deposition of sediment.