Which statement describes the ability of the cell membrane to allow various substance to move through it?

selective permeability

Explanation:

The cellular membrane is selectively permeable which means it allows the movement of little essential substance from outside and movement of non-essential substances from inside. Along with this several neural activities are controlled through this property of cell membrane that allows to and fro.  Movement of specific kind of ions.  

It does not allow movement of all substance, particles and ions through it and hence they are selective.

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.