Final answer:
The first great lesson of Beta Sigma Phi is personal growth and self-improvement, which is a primary focus of the organization aimed at inspiring members to better themselves and their communities.
Step-by-step explanation:
The fellowship of Beta Sigma Phi and its first great lesson is C. Personal growth and self-improvement. Beta Sigma Phi is an international women's social, cultural, and service organization that emphasizes personal development among its members. Though leadership skills, philanthropy, and professional development are important aspects of the organization, the foremost goal is to inspire members to pursue lifelong learning and personal growth. By focusing on these areas, members of Beta Sigma Phi are encouraged to improve their lives and the lives of those around them. This strong foundation of personal development supports other activities such as leadership development, community service, and building professional networks.