Fertilisers are added to increase a soils

Answer: Option B

Fertilizers are added to increase the fertility of the soil.
Fertilizer is the material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments.
Farmers apply these fertilizers in a variety of ways, through dry or pelletized or liquid application processes, using large agricultural equipment or hand tool methods.