The Concentration of Sodium in the Human Body Is Approximately

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass. What is this concentration in ppm (parts per million) ?

A) 1.5 * 10⁶ ppm
B) 1.5 * 10^-3 ppm
C) 0.015 ppm
D) 1,500 ppm
E) 150 ppm