Final answer:
The best metaphor representing Barton's cultural diversity is "A mosaic of traditions," which emphasizes cultural individuality within a collective diversity.
Step-by-step explanation:
In the statement "Barton is a kaleidoscope of languages, ethnicities, and cultures," the best option that represents the metaphor for a range of cultures in Barton would be d) "A mosaic of traditions," depicting the individuality preserved within the diverse cultures of Barton. This metaphor aligns with the concept of multiculturalism where each culture retains its own identity while contributing to the overall diversity of the society, akin to a salad bowl or cultural mosaic. Options such as "a melting pot" suggest assimilation into a singular identity, which is contrary to the idea of individual cultures maintaining their distinctiveness within a collective whole.