Using the IS - LM framework, in which model would monetary policy be more effective (in terms of increasing the level of income)?

Using the IS - LM framework, in which model would monetary policy be more

     effective (in terms of increasing the level of income)? THINK IT THROUGH

     A. I = f (i)             S = f (Y)         G = Go

     B. I = f (i)             S = f (Y)         G = Go - g (i)

Using the IS - LM framework, in which model would monetary policy produce larger

      income changes (per unit of monetary stimulus)? THINK IT THROUGH

1. Tx = Txo
2. Tx = To + tY               t > 0