Answer the question on the basis of the following output data for a firm. Assume that the amounts of all nonlabor resources are fixed.

Number of Workers	Units of Output
0	0
1	30
2	70
3	122
4	165
5	190
6	210

Diminishing marginal returns become evident with the addition of the

Multiple Choice

• first worker.
• third worker.
• fourth worker.
• sixth worker.