In What Environment Are Deltas Typically Formed, and Why Are

In what environment are deltas typically formed, and why are they formed there?

A) around the middles of large lakes far from shore; there is no farther for the sediments to go
B) in submarine river systems because of the "delta" shape of the seafloor basins
C) transitional; decrease in slope (gradient) and sediment carrying power
D) in desert environments in the middles of continents far from the mountains; there is no water or wind left to carry sediment any farther