Oxbows form in rivers because the water erodes soil from the outside of a curve and deposits material at the inside. the river in the picture has an oxbow bend.

if the river is left alone, how might the river appear 50 years from now?
erosion by the river will make the oxbow straighten out.
the river will most likely dry up.
the oxbow may become isolated and become a lake.
the river will most likely look exactly the same.