<span>The student's experiment is modeled after mass wasting, which is also known as mass movement or slope movement. One of the factors of mass wasting is gravity. The water from the hose weighs down the soil and causes the clumps of soil to move downward through the stack of rocks.</span>
The answer is D.
Both Croatia and Bosnia Herzegovina were part of the Yugoslav Wars which lasted from 1991 to 1995 and the Kosovo War occurred from 1998 - 1999.
Therefore the answer is Macedonia as fighting within the country occurred in 2001.