Infiltration is generally greater than Run off where the land has a

1. Gentle slope and permeable soil

2. Gentle slope and impermeable bedrock

3. Steep slope and permeable soil

4 steep slope and impermeable bedrock

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.

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