Final answer:
Sylvia is demonstrating Erik Erikson's concept of generativity by engaging in activities such as volunteering, which are fulfilling the social task of middle adulthood.
Step-by-step explanation:
Sylvia, being a middle-aged woman actively participating in her community, illustrates Erik Erikson's concept of generativity versus stagnation. This concept is a part of Erikson's psychosocial stages of development, specifically addressing the period of middle adulthood which ranges from the 40s to the mid-60s. At this stage, individuals engage in creating a legacy and nurturing the next generation, which could be in the form of raising children, mentoring, or volunteering as Sylvia does.
Conversely, if a person is unable to make such contributions, they may experience stagnation, resulting in a lack of productivity and self-improvement. In Sylvia's case, her participation as a youth coordinator and a Girl Scout leader is a manifestation of achieving generativity. She is contributing to the development of others and therefore is on the path of personal growth and fulfillment that Erikson considered essential during middle adulthood.