This question tests general awareness about the origin of a well known global brand name. Starbucks is one of the most recognisable coffee chains in the world, and its name has a literary root rather than a marketing-agency invention.
The name traces directly back to the first mate character Starbuck in Moby Dick, so the coffee chain's name, with an added "s", is a direct homage to that novel.
Let's summarize:
The correct answer is option (B), Moby Dick.