Final answer:
All of the above activities would be accounted for in a fiduciary fund.
Step-by-step explanation:
The correct answer is d) All of the above; all of the activities mentioned would be accounted for in a fiduciary fund.
A fiduciary fund is a type of accounting fund used by government entities to account for assets held in a trustee capacity. This includes activities such as managing retirement plans for employees (option a), providing debt service for special assessment bonds (option b), and receiving endowed contributions for specific purposes, such as park maintenance (option c).