Final answer:
A mudflow is a fast-moving and wet type of mass wasting that can carry along debris and cause significant damage.
Step-by-step explanation:
Among the options listed, a mudflow is the form of mass wasting that is relatively fast and wet compared to the others. A mudflow occurs when slope material becomes saturated with water, causing the earth to move quickly downhill in a fluid state, often picking up trees, houses, and vehicles. This process can lead to significant destruction, including the blocking of bridges and causing floods along its path.