The correct answer is D. All of the above.
The object of classifying soils is to arrange them into groups according to their properties and behavior. This is done in order to better understand the different types of soils and how they can be used. A soil classification system is meant to provide an accepted and systematic method of describing the various types of soils, eliminating personal factors. The first category of soil classification is based on grain size of the soil. This is because the grain size of a soil is one of its most important properties, and it has a major influence on the other properties of the soil.
Here is a brief explanation of each option:
- Option A: The object of classifying soils is to arrange them into groups according to their properties and behavior. This is done in order to better understand the different types of soils and how they can be used. For example, a soil that is good for growing crops may not be good for building a house. By classifying soils, we can better understand their properties and use them for the right purposes.
- Option B: A soil classification system is meant to provide an accepted and systematic method of describing the various types of soils, eliminating personal factors. This is important because it ensures that everyone is using the same system to classify soils, and that personal opinions do not influence the classification.
- Option C: The first category of soil classification is based on grain size of the soil. This is because the grain size of a soil is one of its most important properties, and it has a major influence on the other properties of the soil. For example, a soil with a lot of sand will be well-drained, while a soil with a lot of clay will be poorly drained.
I hope this helps!