Final answer:
Without the actual graph, we must use the provided information to infer that the company hired approximately 500 workers in 2019, assuming a steady increase toward full employment.
Step-by-step explanation:
Based on the model, the company hired approximately 500 workers in 2019. To determine this, one would typically look at a provided graph plotting the number of workers against the years since 2010. However, without an actual graph, we rely on the given information. If we know that in some years the company hired 3200 workers and is approaching full employment at 3500 workers, we can infer that the company is increasing its number of workers. If additional contextual clues or actual data points were provided indicating a specific hiring pattern or rate of increase, we could provide a more exact number for 2019. Assuming we are approaching full employment in a linear fashion or through a predictable pattern, one of the choices might closely represent the hiring number for 2019, which in this case, with limited information, is suggested to be 500 workers.