We can conclude that the average product curve at 47 units of labor is downward sloping.
Option D is correct.
Marginal product is referred to as the change in output observed with per unit change of an input while putting all other factors of input constant. Example: Labour, materials etc.
Product curves shows the relationship between output and the quantity of a factor; they have the factor quantity on the horizontal axis. Cost curves shows how costs vary with output and have output on the horizontal axis.
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