The correct answer to the question is B. Mudflow.
1. Mudflow is a type of mass movement where materials move like a river. It occurs when water-saturated debris flows downhill, often due to heavy rainfall or melting snow causing the ground to become saturated and lose stability.
2. Rockslide, on the other hand, involves the sudden and rapid movement of rocks or boulders down a slope, typically triggered by factors like earthquakes, erosion, or human activities.
3. Wildfire is a rapid and uncontrolled spread of fire through vegetation in forests, grasslands, or other areas, usually driven by wind and dry conditions. It does not involve materials moving like a river.
4. Soil creep refers to the slow movement of soil downhill over time due to gravity, typically not as fast or dramatic as mudflow.
Therefore, among the options provided, mudflow best fits the description of a mass movement where materials move like a river.
