the law of increasing costs means that as production shifts from one item to another,

a. the cost of production gets cheaper and cheaper.

b. the cost of producing an item stays the same no matter how many are produced.

c. more and more resources are necessary to increase production of the second item.

d. the land costs of increasing production rise much more steeply than do the labor costs.

The best and most correct answer among the choices provided by your question is the third choice or letter C.

The law of increasing costs means that as production shifts from one item to another,  more and more resources are necessary to increase production of the second item. 

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