It's not shallow roots, because most plants would get permafrost if they go any deeper. The dense hairs help keep the plants get enough heat. It's not low to the ground because the plants from getting harsh winds and even colder temperatures above the snow. So by elimation and the fact that I can't think of a use for the last one, I concluded that C rentention of dead leaves is the correct answer. Hope this helps :)
Answer:
the answer is retention of dead leaves, hope this helps
