Answer: c. Debt Service Fund and General Fund
Step-by-step explanation:
The Sinking fund is a Debt Service Fund as it was created to retire some general obligation bonds. Every transaction that had to do with the retirement of debt as well as contribution to the retirement of debt would go in this account.
The General fund is also needed because this is the main fund of a Government entity. Everything that does not go through special funds is recorded here. This Fund therefore would show that the city made a $550,000 contribution to the sinking fund.