Consider the data in the following table for the years $1969$ and $1970($where the values for real GDP and potential GDP are in $2012$ dollars$)$:

Sources:U$.$S$.$ Bureau of Labor Statistics; and U$.$S$.$ Bureau of Economic Analysis.

a$.$ In $1969,$ actual real GDP was greater than potential real GDP$.$ Which of the following best explains this?

A$.$ There has been a supply shock that has reduced potential output.

B$.$ The economy is in a recession and thus potential GDP is less than actual GDP$.$

C$.$ The economy can produce a level of GDP above potential GDP in the short run.

D$.$ The data reported by the Department of Commerce are incorrect.

A$.$ Labor productivity declined, and thus the demand for labor fell, creating unemployment.

B$.$ There must have been a decrease in aggregate demand that caused a recession.

C$.$ Potential GDP increased significantly, but actual GDP did not, and thus there is unemployment.

D$.$ Because there was more inflation, there must be more unemployment.

c$.$ The table does not give the inflation rates for $1969$ and $1970.$

If the inflation rate for $1970$ is greater than the inflation rate for $1969,$ it is likely that the recession was caused by rather than