d. Gulf Coast
Step-by-step explanation:
Mississippi is completely landlocked and is flooded by the Mississippi river on one side and on the other side is surrounded by Atlanta.
This makes it impossible to have a gulf coast as then it would have to be on the sea coast which is not the case.
As the terrain is swampy and full of marsh lands, all other relief features given here are possible , even including pine which is local to the region and usually found in huge numbers in certain areas.