The correct answer is C. continental glaciers.
Continental glaciers are the largest type of glacier, covering more than 5 million square kilometers (1.9 million square miles) of Earth’s surface. They are found in Greenland, Antarctica, and some smaller areas in the Arctic and sub-Arctic. Continental glaciers are much thicker than mountain glaciers, and they flow much more slowly. They can move at speeds of only a few centimeters per year.
Mountain glaciers are glaciers that form on mountains. They are much smaller than continental glaciers, and they flow much faster. Mountain glaciers can move at speeds of up to 100 meters per year.
Alpine glaciers are a type of mountain glacier that forms in high mountain ranges. They are characterized by their steep slopes and their relatively small size. Alpine glaciers are found in the Alps, the Himalayas, and other mountain ranges around the world.
Piedmont glaciers are a type of glacier that forms when mountain glaciers flow out onto a plain. They are characterized by their broad, flat fronts and their slow movement. Piedmont glaciers are found in Greenland, Antarctica, and some smaller areas in the Arctic and sub-Arctic.