Where was the first national BPA conference held?

The first national BPA conference was held in Greenlake, Wisconsin. This location is significant because it marks the birthplace of the Business Professionals of America organization, which aimed to support students in the field of business education and provide them with opportunities for leadership and professional development. The choice of Greenlake reflects the organization's roots and the historical context of its establishment.

The other options represent cities that have hosted memorable BPA events or are significant in various contexts, but they do not pertain to the origin of the national conference. By identifying Greenlake, Wisconsin, as the correct answer, it highlights the beginnings and foundational aspects of BPA, which are essential for understanding the organization's history and evolution.