Which of the following is a method used to prevent soil erosion? select one: a. tilling the soil b. contour farming c. adding fertilizers to soil d. adding worms to soil

 I believe the answer is B. Contour farming
In Contour farming , we put the plant on perpendicular method, and tilling sloped  the land along lines of consistent elevation.
By Doing this, we will ensure that every part of the soil will receive proper amount of water from the rainfall, hence prevent the chance of soil loss from surface erosion.