Final answer:
The tax multiplier is -1.0.
Step-by-step explanation:
The tax multiplier represents the effect of changes in taxes on the overall economy. It measures the change in aggregate demand that results from a change in taxation. The formula for the tax multiplier is given by:
Tax Multiplier = -MPC / (1 – MPC) = -0.5 / (1 - 0.5) = -1.0
Therefore, the correct answer is c.-1.0.