Solve the problem. Test marketing for a new health-food snack product in a selected area suggests that sales (in thousands of dollars) will increase at a rate given by S'(t) = 40 - 40e-0.16t t months after an aggressive national advertising campaign is begun. Find total sales during the second 12 months of the campaign. (Round to the nearest thousand dollars.) Select one: A. $449,000 B. $511,000 C. $693,000 D. $267,000