Answer the following question given this paragraph: 

A mudslide is the sudden flow of mud down a slope because of gravity. Mudslides occur where the soil is mostly clay. Like landslides, mudslides usually occur when the soil is wet. Wet clay forms very slippery mud that slides easily. You can see an example of a mudslide in Figure below .


Q: What do you call the sudden flow of mud down a slope because of gravity?

 Choices:

- rockflow

- typhoon

- mountainside

- mudslide

A:
mudslide
