Chris wrote the following characteristics of two landforms. landform a: has underground waterways landform b: is a flat low lying piece of land next to the ocean which statement is most likely correct? landform a is a wetland and landform b is a ridge. landform a is a coastline and landform b is a mountain. landform a is a karst landform and landform b is a coastline. landform a is a mountain and landform b is a karst landform.