Answer:
D) fertilizer to replace nutrients that leach from the soil.
Step-by-step explanation:
Ultisols are soils that are often formed in really climate weathers, with humid and warm characteristics, they are often red because they are made of clay, this creates to have little to no nutrients, so it´s not very fertile, so they have to use a lot of retilizers to replace nutriens that are lacking form the soil.