Krummholz Can Be Useful to Physical Geographers Trying to Understand

Krummholz can be useful to physical geographers trying to understand the environment because

A) they indicate that there is a soil water deficit where they exist.
B) their branches reveal the prevailing wind direction.
C) they are a useful indication that the biome is temperate forest.
D) they are almost always found atop sandstone-based parent material.