The best-supported inference from the details in the passage is:
c. The narrator uses imagination to escape the boredom of daily life.
This is evident from the way the narrator describes the shopping cart's journey as an imaginative escape in search of adventure, knowledge, and love, despite its mundane surroundings. The narrator's identification with the shopping cart reflects an attempt to transform the everyday and banal into something more meaningful, suggesting a use of imagination as an escape from boredom.