The correct answer is A. Gorge.
A gorge is a deep, narrow valley with steep sides. It is formed by the erosion of a river or stream over time. Gorges are often found in mountainous areas, where the land is more rugged and the rivers are more powerful.
A canyon is a larger, wider version of a gorge. It is also formed by the erosion of a river or stream, but it is typically much larger and more impressive. Canyons are often found in arid or semi-arid regions, where the lack of vegetation allows the river to erode the land more easily.
A waterfall is a place where a river or stream flows over a steep drop. Waterfalls can be found in a variety of landscapes, but they are most common in mountainous areas. Waterfalls are often popular tourist destinations, as they offer stunning views and a sense of natural wonder.
A landslide is a mass movement of rock, soil, or debris down a slope. Landslides can be caused by a variety of factors, including earthquakes, heavy rains, or human activity. Landslides can be very destructive, and they can often cause loss of life and property.