Q: Fact 1: Being exposed to wind can cause erosion of soil. Fact 2: To many people, soil is nothing but dirt. Given the two facts above, being exposed to what can cause erosion of dirt?

pick from the following.
i. cement;
ii. wind;
iii. deltas;
iv. rocks;
v. rain;
vi. a building;
vii. rivers;
viii. cars;
The answer is:
ii.