What was a significant milestone for TSA in 2014 regarding membership?

Reaching over 200,000 members in 2014 was a significant milestone for the TSA because it demonstrated substantial growth and increased engagement within the organization. This membership achievement not only reflected the expanding influence and outreach of the TSA but also indicated the organization's ability to attract and retain individuals interested in its mission and programs. A large membership base often correlates with increased resources, networking opportunities, and enhanced advocacy for the interests of its members. Such achievements mark a pivotal moment in an organization's history, signifying its relevance and the trust it commands in the community, as well as potentially establishing a foundation for future initiatives and expansions.

In contrast, the other choices, while potentially significant in their own rights, do not represent a quantifiable and decisive milestone in the same way that reaching a membership number does. For instance, initiating educational programs or forming partnerships may contribute to the organization's growth and influence but do not illustrate the level of commitment and interest reflected by membership numbers. The first national conference, while an important event, would not capture the broader growth metric that membership figures represent.