Other Things Being Equal,which of the Following Situations Will Cause

Multiple Choice

Other things being equal,which of the following situations will cause unit costs to rise and the AS curve to shift upward?

A) There is a fall in the price of oil.
B) The government reduces payroll taxes.
C) Wage increases exceed productivity increases.
D) Wages increase at the same rate that labour productivity increases.
E) Wage and price controls are in effect.