Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions .
Exhibit: Using the Aggregate Demand/Aggregate Supply Model 2
-(Exhibit: Using the Aggregate Demand/Aggregate Supply Model 2) A shift from SRAS₁ to SRAS₂ could have been caused by all of the following except

A) an increase in the consumer confidence index.
B) an increase in payroll tax.
C) a rise in health care costs which raises the cost of employing labor.
D) terrorist attacks that destroys an economy's infrastructure.