-Refer to Figure 7.2.With which worker does diminishing marginal returns set in? A) The 20^th worker B) The 30^th worker C) The 38^th worker D) The 50^th worker

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Diminishing marginal returns occur when adding an additional factor of production results in a smaller increase in output. Without seeing Figure 7.2, the correct answer is inferred based on the typical pattern where after a certain point, each additional worker contributes less to output than the previous one. The 3rd worker is a logical point for diminishing returns to begin in many production scenarios, as initial workers may significantly increase output, but as more workers are added, they may start to get in each other's way or run out of equipment to use efficiently, leading to a decrease in the marginal productivity of each additional worker.