If a positive factor for farming the land is growing food for a growing population, a negative could be air pollution deforestation mining accidents unemployment

The correct answer is option B (deforestation).

Even though farming the land is positive as regards growing food for a growing population, it also has a negative aspect since it implies deforestation  (trees and other vegetation is removed).

Once trees are removed, the immediate effect is FLOODING because the roots of plants are in charge of absorbing water.

answer; ///i believe that the correct answer is (a) the great depression

they were all fought in the middle east during ww1