The long-run average cost curve is at a minimum at a level of output where :

c. the long-run average cost curve is tangent to the lowest point on a short-run average total cost curve.

I thank option  D right answer ...........

All of the above is the correct option.

I Will Choose Option " D " ...

1. The correct answer was: d. all of the above occur.>>>>>>>>>>>>>>>>>>>>>>

The answer is : Option ( D )

answer D : all of the above ______________________________

 d. all of the above occur. ....................................................................

D

Thanks 

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 d. all of the above occur.lllllllllllllllllllllllllllllllllllllllllll

Option (D) All of the above