Which of the following reasons explain why fertilizers are added to soils?

Fertilizers are added to soils to increase the nutrient level available to plants. Plants require a range of nutrients to grow and develop, including nitrogen, phosphorus, and potassium. While these nutrients are naturally present in soils, they can become depleted over time as plants use them up. Fertilizers are added to soils to supplement the available nutrients and ensure that plants have access to the nutrients they need to thrive. Fertilizers typically contain a combination of nitrogen, phosphorus, and potassium, as well as other micronutrients that may be lacking in the soil. When added to the soil, these nutrients are absorbed by plant roots and used to support growth and development. While fertilizers can have other benefits, such as improving water retention capacity and increasing organic matter content, their primary purpose is to increase the nutrient level available to plants. Therefore, the correct option to choose from the given reasons is "increasing the nutrient level".