Money supply & yield (R16 EOC #16)

As to the effect of an increase in CB money supply on corporate FI market, the solution basically says yield will increase, which is a negative.

However, we all know that a MS increase should result in a drop in interest rate/yields due to the abundant supply of money, at least in the short term.

Now, I agree that yield will rise in the LT, but how do you even know if the question is asking for the LT or the ST result?

Any help would be grealty appreciated.

Any takers?