Citrus has always been the most important crop in Florida.
True
False

True, the citrus industry generate $8.6 billion in economy activity on Florida.

a

explanation:

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.