Explanation:

Black soils, also known as Regur soils, are typically rich in lime, iron, magnesium, and potash, making options (B), (C), and (D) incorrect as they are generally present in sufficient quantities. However, these soils are characteristically deficient in organic matter, nitrogen, and phosphorus. The lack of nitrogen and phosphorus limits their fertility and often necessitates the use of fertilizers to enhance crop yields. Therefore, the most accurate answer for the deficiency in black soil is Nitrogen and Phosphorus.