Which characteristic best defines the membership growth of HOSA?

The characteristic that best defines the membership growth of HOSA is that it is rapid and expansive. This growth reflects the organization's ability to attract a diverse range of students interested in health science careers across various regions. HOSA has successfully broadened its outreach through the establishment of new chapters in schools nationwide, engaging students from different educational backgrounds and promoting health-related careers. The organization's initiatives, including leadership development and competitive events, have resonated with many, contributing to a vigorous increase in membership.

In contrast, localized growth in specific states or concentration in urban areas does not capture the national reach and inclusivity that HOSA aims for. Stagnation would imply a lack of growth or interest, which is contrary to the demonstrated rise in participation over the years. The expansive nature of HOSA's growth signifies its influence and relevance in preparing future healthcare leaders, showcasing its commitment to expanding opportunities for student involvement across the country.