Which practice is a sustainable method of food production? a. using drip irrigation systems to conserve water b. allowing chemical pollutants to build up in soil c. creating a monoculture crop over large areas d. practicing high-density livestock farming

The appropriate answer is a. using drip irrigation systems to conserve water. Drip irrigation allows water for plant growth to be delivered right to the root of the plant. This has more benefits than just simple water conservation.

Allowing pollutants to build up in soil will over time destroy the soil structure and affect soil fauna which are essential in crop growth. Mono culture is not a sustainable practice because different crops use different minerals in different proportions. Overtime the soil constantly exposed to one crop all the time will loose fertility. High density livestock rearing has many disadvantages. Some include easy spread of disease, meat contamination and the large amount of waste to manage. This practice is also inhumane.   

The answer is b metal denting