What is the primary purpose of selecting a liming material?

The primary purpose of selecting a liming material is to neutralize soil acidity. Soils can become acidic, particularly in regions with high rainfall, which can limit nutrient availability and negatively impact plant growth. By applying lime, which is primarily calcium carbonate or magnesium carbonate, the pH of the soil can be raised to a more neutral level. This process not only helps in increasing the availability of essential nutrients but also promotes beneficial microbial activity in the soil.

While enhancing moisture retention, improving soil fertility with micronutrients, and increasing soil organic matter are important considerations in soil management, they are not the primary objectives of liming. The primary and most direct impact of liming is on acidity levels, making option C the correct choice.