Final answer:
The question addressing an important contributor to successful aging is c. Do you feel like you actively engage with life, as it pertains to social connectedness and active engagement, which are key aspects of successful aging.
Step-by-step explanation:
An important contributor to successful aging is social connectedness, which can be gleaned from the socioemotional selectivity theory. This theory suggests that although older adults may have fewer social contacts, the relationships they do maintain are deeper and more meaningful. Addressing this aspect, the most relevant question a nurse could ask to determine an important contributor to successful aging would be: c. Do you feel like you actively engage with life? Engaging actively with life can often be facilitated by having a reliable social network and engaging in meaningful activities that provide a sense of purpose and connectedness.
The other options, while important, do not directly address social connectedness and engagement. Being free of illnesses (option a) and feeling financially secure (option b) do contribute to one's well-being but are not specific to the social aspects of aging. Likewise, having a reliable support network (option d) is related but the question is indirectly addressing the concept as it focuses more on availability of support rather than active engagement with life.