Refer to Table 10.3. Diminishing returns to labor start with the ________ worker.

A) second
B) third
C) fourth
D) fifth

Diminishing returns to labor occur when adding an additional worker results in a smaller increase in output than the previous worker added. Without the specific data from Table 10.3, the general concept dictates that the correct answer is identified when the marginal product of labor begins to decrease, which typically happens after several workers have been added. Given the options, the choice indicating the fourth worker suggests the point at which adding more workers leads to a decrease in the marginal product of each additional worker, aligning with the concept of diminishing returns.