You extract all of the arsenic from a 12.0 g sample of rice into 250.0 mL of water and send it to the lab for analysis. The result is that the solution contains 38.2 gL^-1 of arsenic. What was the arsenic concentration in the rice?

A.) 69.4 ppb

B.) 769 ppb

C.) 694 ppb

D.) 796 ppb

E.) 115 ppb