Which of the following is a key historical event for FFA in 1935?

The key historical event for FFA in 1935 is the founding of the Future Farmers of America. During this year, FFA was established by a group of 33 agricultural students in Virginia who recognized the need for an organization to support and develop youth in agriculture. This marked a significant moment in FFA history as it laid the groundwork for the organization's growth and development.

The other options mention milestones and events associated with FFA, but they do not accurately represent the pivotal moment that was the founding of the organization itself. For example, surpassing 100,000 members and the establishment of agricultural education standards occurred later as FFA grew in influence and numbers, while the first national convention was held in 1928, predating the establishment of the organization. Therefore, the founding of the Future Farmers of America in 1935 is the most significant historical event for that year.