The correct answer is D. all of the above.
Dispersed type of soil structure is an arrangement comprising particles having face to face or parallel orientation, edge to edge orientation, and edge to face orientation.
In a dispersed soil structure, the particles are not bound together and are free to move around. This type of soil structure is often found in sandy soils.
The face to face or parallel orientation of the particles in a dispersed soil structure means that the particles are aligned with each other, like a deck of cards. This type of orientation is often found in soils with a high sand content.
The edge to edge orientation of the particles in a dispersed soil structure means that the particles are aligned at right angles to each other, like a brick wall. This type of orientation is often found in soils with a high clay content.
The edge to face orientation of the particles in a dispersed soil structure means that the particles are aligned at an angle to each other, like a shingle roof. This type of orientation is often found in soils with a mixed sand and clay content.
Dispersed soil structures are often unstable and can easily be eroded by wind or water. They are also not very good at holding water or nutrients.