How many times has the delegate assembly number changed at the National FFA Convention?

The correct answer is that the delegate assembly number has not changed at the National FFA Convention. Since the inception of the National FFA Organization, the delegate assembly has consistently operated with the same structure, ensuring that representation and the voices of members are maintained effectively. This consistency emphasizes the importance of each delegate's role in making decisions and shaping policies within the organization.

Understanding that there has been no change highlights how foundational structures can remain stable over time, providing continuity in governance and representation within organizations like FFA. The other options suggest that there have been changes to the delegate assembly number, but this is not supported by the historical facts surrounding the organization.