Answer:
The best choice that describes the function of the underlined sentence in the text as a whole is:
A. It provides information that helps support a claim about a discovery's significance that is presented in the following sentence.
The underlined sentence provides information about the archaeological excavation of Market Street Chinatown and the discovery of bones from a freshwater fish species native to Southeast Asia. This information supports the claim about the significance of the discovery, which is presented in the following sentence. The sentence highlights the evidence of Asian food products being imported to the United States in the 1800s, revealing the multinational dimensions of the trade networks linking Chinese diaspora communities.