applying nitrogen-rich fertilizers keeping grasses trimmed short building houses on stilts planting trees along cliffs
I gave my students this multiple choice question: Human actions can change the rate at which soil erodes. Which of the following would most likely slow the rate of soil erosion?

Only one answer is correct among these 4 choices:
- applying nitrogen-rich fertilizers
- keeping grasses trimmed short
- building houses on stilts
- planting trees along cliffs

Could you tell me which one is correct?

planting trees along cliffs