Economic policy choices often produce similarly conflicting outcomes. Policymakers must therefore prioritize economic policy goals, or attribute different weights to desirable and undesirable outcomes from the introduction of various policies. In the case of the Phillips curve, for example, policymakers can tackle this tradeoff using various policy instruments: By changing the level of government spending or tax collection, and the quantity of money put in circulation, policymakers can, in the short run, influence the inflation and unemployment rate pairs. The correct answer is C.