To compare the speaker's perspective in "Free" with Randall's perspective in "Popular Problems" at the end of the story, the most appropriate response is:
a. Both characters struggle with the idea of freedom.
Both characters ultimately confront their perceptions of what freedom means. Randall realizes that happiness comes from genuine friendship rather than material wealth, indicating a deeper understanding of personal freedom and connection. The speaker in "Free" may similarly grapple with the nuances of freedom and what it truly entails in their own context.