A shift from production level B to production level A would
A) represent an unattainable level of production and result in an inefficient use of resources.
B) result in an opportunity cost in the production of output Y and would be considered an efficient use of resources.
C) result in an opportunity cost in the production of output X and would be considered an efficient use of resources.
D) result in an opportunity cost in the production of output Y and would be considered an inefficient use of resources.