Refer to the data. In the long run the firm should use plant size “A” for:

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Use the following data to answer the question. The letters A, B, and C designate three successively larger plant sizes.

A. all possible levels of output.
B. 30 to 60 units of output.
C. 10 to 30 units of output.
D. all outputs greater than or equal to 40.

answer:

C. 10 to 30 units of output.