What effect have both the reagan and bush plan of lowering taxes and the obama economic stimulus plan of greater spending had on the federal budget ?
a.) they both increased the public debt
b.) they both reduced the debt
c.) the both balanced the budget
d.) they both reduced the deficit

The effect that both the Reagan and bush plan of lowering taxes and the Obama economic stimulus plan of greater spending was: A.) they both increased the public debt 

Both plans was enacted along with a massive increase in government spending.

Reagan's and Bush plan increased government spending to support local business while Obama's plan increased Government's spending for welfare allocation. 
These huge spending that both of these governments do is the one that caused the increase in public debt