Part A Which of the following statements regarding the umbilicus and the chin is true?

A. The umbilicus is superior to the chin.
B. The umbilicus is medial to the chin.
C. The chin is caudal to the umbilicus.
D. The umbilicus is caudal to the chin.

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.