10. It is often said that work productivity is impacted by your level of stress. Suppose this graph represents the relationship between productivity and stress: Productivity Stress Based on this graph, what can you conclude about productivity and stress, assuming the relationship is causal? a. Increased levels of stress will increase your level of productivity b. Increased productivity can raise your level of stress, but only up to a certain point c. There exists an optimal amount of stress that leads to the greatest level of productivity d. Productivity is a linear function of stress