A
In response to mounting public concern, an airplane manufacturer implemented a program with the well-publicized goal of reducing by half the total yearly amount of hazardous waste generated by its passenger-jet division. When the program began in 1994, the division' s hazardous waste output was 90 pounds per production worker; last year it was 40 pounds per production worker. Clearly, ttherefore, charges that the manufacturer' s program has not met its goal are false. Which of the following is an assumption on which the argument depends?
A: The number of production workers assigned to the passenger-jet division was not significantly less in 1994 than it was last year.
B: The average number of weekly hours per production worker in the passenger-jet division was not significantly greater last year than it was in 1994.
C: Since 1994, other divisions in the company have achieved reductions in hazardous waste output that are at least equal to that achieved in the passenger-jet division.
D: The amount of nonhazardous waste generated each year by the passenger-jet division has not increased significantly since 1994.