Answer:
1. This will reduce the U.S. money supply because more excess reserves to be hold which means that less amount of money lend to the public.
2. This will not affect U.S. money supply because savings account is also a part of money supply.
3. This will reduce the U.S. money supply because there is a flow of money from public to Fed.
4. This will increase the money supply because it will be less profitable for the depository institutions to deposit at the fed. So, they start lending to the public which increases the money supply in the U.S. economy.