Unanticipated inflation is associated with cost increases which are not expected

At various times, the United States has undergone the painful process of reducing military spending. Military bases from the Carolinas to California pleaded to be spared, citing huge job losses if they close. How can one rationally decide which bases to shut down, given the necessity of jobs?

Based on the figure below. Starting from long-run equilibrium at point C, a tax increase that decreases aggregate demand from AD1 to AD will lead to a short-run equilibrium at point ________ and eventually to a long-run equilibrium at point ________, if left to self-correcting tendencies.

A. D; C B. D; B C. A; B D. B; C