The optimum fertiliser dose is one which maximises

Answer: Option C

The optimum fertilizer dose maximizes Profits.
A fertilizer is any 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.
Fertilizers are commonly used for growing all crops, with application rates depending on the soil fertility, usually as measured by a soil test and according to the particular crop. The dose should be optimized by looking after all the physical and chemical properties of the soil so that the productivity of the soil is increased.