Answer :
The answer would be
B) Glacier.
Explanation:
Thick layers of snow are slowly compacted into glacial ice. A glacier sways look like a solid block of ice, but it is really moving very deliberately. The glacier moves because stress from the weight of the overlying ice creates it to distort and flow.
Glaciers found to form when snow settles in the same area year-round, where sufficient snow banks to convert into ice