Who was leading during the first National Convention of the organization?

The first National Convention of Delta Sigma Theta Sorority, Inc., held in 1919, was led by Jimmie Bugg Middleton. She played a pivotal role in establishing the foundation and governance structure of the sorority during its early years. Middleton's leadership was instrumental in guiding the organization through its formative stages, fostering a sense of unity and purpose among the members who were committed to public service and advocacy for African Americans.

The contributions of other individuals listed in the options are significant in the broader context of the sorority's history, but Middleton’s leadership during the first convention specifically cemented her place as a key figure in the organization’s development.