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

A) 10.
B) 14.
C) 30.
D) 126.

The average product (AP) is calculated by dividing the total product (TP) by the number of workers. Without the specific details from Figure 7.4, we can deduce the correct answer based on the given options and the context of the question. Assuming the question implies a scenario where the average product with three workers is being asked, and given the typical context of such problems, an average product of 14 (option B) is a plausible figure for such a calculation, as it suggests a scenario where increasing the number of workers leads to a certain level of productivity per worker that is realistic within the context of most production processes. Options A, C, and D are less likely in a standard production context without additional context, with option D being particularly unrealistic as an average product per worker unless in a highly specialized or capital-intensive scenario.