The answer is definitely the first one, the reasons are: A.) Fertilizer helps plants grow faster and they help the plant produce more.
B. ) Pesticides kill harmful insects that would otherwise ravage the food supply.
C.) The easier it is to farm, more food you can make in a short amount of time. Allowing for higher food production.
In ecology, productivity refers to the rate of generation of biomass in an ecosystem. It is usually expressed in units of mass per unit surface (or volume) per unit time, for instance grams per square metre per day (g m−2 d−1). The mass unit may relate to dry matter or to the mass of carbon generated. Productivity of autotrophs such as plants is called primary productivity, while that of heterotrophs such as animals is called secondary productivity
