Formation of Soil Structure
Soil structure refers to the arrangement of soil particles and the way they are grouped together. It is an important characteristic of soil that significantly affects its properties and behavior. Soil particles can be arranged in different ways, depending on various factors such as the type of soil, compaction, moisture content, and organic matter content.

Parallel Orientation of Soil Particles
When soil particles have a parallel orientation, it means that they are aligned in a specific direction. This can occur due to various reasons, such as the forces acting on the soil, the history of soil deposition, or the presence of certain minerals or organic matter.

Dispersed Arrangement
A dispersed arrangement of soil particles refers to a situation where the particles are randomly distributed and do not have a specific orientation. In this arrangement, the particles are not aligned in any particular direction and are scattered throughout the soil mass. This type of arrangement can occur in soils that have undergone high levels of weathering or erosion, where the particles have been transported over long distances and have lost any original orientation.

Coarse Grained Skeleton
A coarse-grained skeleton refers to a soil structure where the majority of the particles are larger in size. In this arrangement, the soil contains a significant proportion of sand and gravel particles, which provide a framework or skeleton for the soil mass. This type of structure is commonly found in sandy soils or gravels, where the particles are relatively large and do not easily adhere to each other.

Honeycomb Arrangement
A honeycomb arrangement of soil particles refers to a structure where the particles are arranged in a network of voids or pores, resembling the cells of a honeycomb. This arrangement is typically observed in soils with a high clay content, where the clay particles tend to aggregate and form stable clusters. The voids between these clusters create a network of interconnected pores, providing a unique structure to the soil.

Single Grained Arrangement
A single grained arrangement of soil particles refers to a structure where each particle is separate and distinct from the others, without any significant aggregation or bonding. This type of arrangement is commonly observed in loose, dry, and granular soils, where the individual particles are not strongly bound together.

Conclusion
In the given options, the correct answer is option 'A', dispersed arrangement. This means that the soil particles in the arrangement are randomly distributed and do not have a parallel orientation. This type of structure can occur in soils that have undergone extensive weathering or erosion, where the particles have lost any original alignment or orientation.