Children Under the Age of Six with More Than 0 $\times$

Multiple Choice

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q.or have behavior problems.What is the molality of a solution which contains 0.10 ppm of lead?

A) 4.8 $\times$ 10^-10 m
B) 4.8 $\times$ 10^-7 m
C) 4.8 $\times$ 10^-4 m
D) 4.8 $\times$ 10^-1 m
E) None of these choices is correct.