The answer is D. Icecaps and Glaciers.
The reason is because iceburgs/glaciers contain huge chunks of ice. Glaciers have around 0.1 square kilometers, or 25 acers.Around 101171.411 sq meters, of ice. Iceburgs are around 5 meters, or 16 feet (across) Again,of ice.
We know that to make ice, you freeze water, by putting it in a cold enviorment, or simply putting a glass of water in you freezer.
Hope this helps!
~Learning with Natalia~