Which of These Statements Is Correct

Multiple Choice

Which of these statements is correct?

A) Periglacial regions occupy about 20 percent of Earth's land area.
B) Subarctic climate regions with seasonally snow-free ground are periglacial regions.
C) Permanently frozen subsurface ground is called permafrost.
D) Periglacial regions can sometimes feature polygonal rock formations.
E) All of these are correct.