Question

If the marginal product function of quibs is positive from 0 to 25 units of quibs, and 0 for 25 units of quibs and above, the total product function of quibs must be:

A Upward sloping from 0 to 25 and downward sloping above 25
B Horizontal from 0 to 25, and downward-sloping above 25
C It is impossible to tell without having information about the average product function
D Upward sloping from 0 to 25 and horizontal above 25
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