Some Plants Have a Root System That May Be as Much

Some plants have a root system that may be as much as 130 times larger than the shoot system.What is a major function of this vast root structure?

A) To support the aboveground plant structure
B) To enable regrowth if the shoot system is destroyed
C) To provide surface area for absorbing water and soil nutrients
D) To provide habitat for soil organisms that protect the plant
E) To provide protection against potentially damaging soil organisms