Answer:
B.the law of increasing opportunity cost
Explanation:
PPF is graphical representation of product combinations that an economy can produce, given resources & technology
It is downward sloping because - given same resources & technology, one good 's production can be increased by decreasing production of other good.
Resources are assumed to be unequally efficient in production of resources. Shifting production from one good to other occurs with increasing Marginal Opportunity Cost (amount of good sacrifised to gain an additional unit of the other good.
This makes slope of PPC i,e MOC to rise & makes it concave i.e outward bending
The law of increasing opportunity cost gives the bowed-outward shape to the PPF.
PPF means production possibility frontier.
The production possibility frontier means a graphical representation of product combinations that an economy can produce, given resources & technology
The law of increasing opportunity cost states that when we continue to increase the production of one good, the opportunity cost of producing that next unit increases.
Hence, the law of increasing opportunity cost gives the bowed-outward shape to the PPF.
Therefore, the Option B is correct
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