Final answer:
The collection of papers, seminars, lectures, panel discussions, and demonstrations presented at a yearly conferences of tax professionals is called the annual proceedings.
Step-by-step explanation:
The correct answer is a. Annual Proceedings. The collection of papers, seminars, lectures, panel discussions, and demonstrations presented at a yearly conferences of tax professionals is called the annual proceedings. These proceedings serve as a valuable resource for tax professionals to stay updated on the latest developments and research in the field.