Concept:A fertile soil can be recognised by properties such as organic matter content, colour, and texture.
Solution:Soil fertility is the ability of soil to supply nutrients and support plant growth.
The amount of organic matter directly adds nutrients and improves soil structure.
Colour is an indicator: dark soil usually contains more humus and is often fertile.
Texture shows the balance of sand, silt, and clay, which affects water and nutrient holding.
All three factors help describe a fertile soil, so statements I, II and III are all correct.
Answer:Option D (I, II and III)