Answer:
A) higher interest rates ; largely offset by the lower interest rates
Step-by-step explanation:
If the government carries on an expansionary monetary policy, it will lower interest rates and increase the money supply in an attempt to increase aggregate demand. If at the same time it increases the interest rate it will pay for borrowing money (e.g. increase treasury bills' interest rates), that would make no sense since one policy would offset the other.
A government cannot increase the money supply and then increase the interest rates on treasury bills since that would lower the money supply again.