The Concentration of a Trace Essential Element in the Body $\mu$

The concentration of a trace essential element in the body is typically in the range of _____per gram ofbody mass.

A) 1 $\mu$ g to 1 mg
B) 1 $\mu$ g to 10 mg
C) 10 $\mu$ g to 10 mg
D) 10 $\mu$ g to 100 mg
E) 100 $\mu$ g to 100 mg