Hello! The answer is A, heterogenous.
Mud and water is a type of mixture called a suspension. After a while, mud particles will settle on the bottom of the jar because mud particles are too large to dissolve in water unlike salt solutions. This is a process called deposition.
You can observe this in common substances like cough syrups and powdered juice. Hence, why you need to shake or aggravate them to keep the powders/particles suspended.
Hope this helps!
