The Reason That Certain Plants Can Grow in Soils Con­taminated

The reason that certain plants can grow in soils con­taminated with high levels of heavy metals is that they

A) do not take up the heavy metals.
B) excrete the heavy metals.
C) have a genetic tolerance to the heavy metals.
D) use the heavy metals for normal biochemical functions.
E) are toxic to herbivores due to the heavy metals.