How does nucleic acid’s function relate to its structure?

A functional group changes the structure of a compound but does not alter its chemical properties

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.

2%? i tried finding the exact sorry if it's not 100% correct ; -;