What can lead to grasslands being converted to desert? 

A)  occasional short droughts 
B)  barbed-wire fencing 
C)  overgrazing 
D)  urban sprawl

Overgrazing by livestock can lead to grasslands being degraded and eventually turning into desert. Livestock consume too much vegetation, leading to soil erosion and loss of nutrients, making the land unfit for plant growth. As a result, the grass cover declines, leading to desertification. A short drought or barbed-wire fencing may have an impact, but it is not a primary cause of grasslands being converted to deserts. Urban sprawl, on the other hand, leads to the conversion of natural ecosystems into built environments and is not typically associated with grassland degradation into desert.