Answer
The policy that will boost spending more will be the permanent tax cut. The permanent tax cut will also have the greater output on aggregate demand.
Work Step by Step
A temporary (one year) tax cut would not increase the spending of consumers by much (as it it a temporary change).
A permanent tax cut would allow consumers to think that their finances have improved considerably, which would have a greater impact on spending and aggregate demand (compared to a one year tax cut).
