Answer : Option A) Weathering.
Explanation : Any rock exposed at the Earth's surface will undergo weathering. This occurs because most rocks are formed at high pressures and temperatures, which are away from the influence of oxygen or water. When these are brought to the surface by volcanoes or any Earthly movements, such material is found to be chemically unstable and will break down into a more stable form.
The rocks are found to get weathered in two ways: chemically and mechanically which involves erosion by rivers, wind, waves, or glaciers.
