Which of the following does NOT cause an object to accelerate?

A. slowing down
B. Change in direction
C. Speeding up
D. Constant velocity

b

Explanation:

well we can't tell you because we cant see the time give a screen shot or something.

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.