Refer to Figure 7.4. The average product with six workers is

A) -8.33.
B) -5.
C) 5.
D) 8.33.

The average product is calculated by dividing the total product by the number of workers. Without the specific details from Figure 7.4, the correct answer cannot be determined from the information provided. However, given the options, if the question implies that the average product with six workers is a positive value, and assuming the calculation was done correctly in the context of the question, 8.33 would be a plausible result for an average product, indicating a positive output per worker.