Concept:Lime neutralises acidic soil and makes essential nutrients available to plants.
Explanation:Poor soil is often too acidic.
In highly acidic soil, phosphorus gets locked up in insoluble compounds and cannot be absorbed by plants.
Adding lime raises the soil
pH and supplies calcium ions.
As the acidity decreases, soil phosphorus is released into a soluble form that roots can take up.
Therefore, liming mainly increases the available quantity of phosphorus in the soil.
Answer:B. phosphorus