When it comes to choosing a sentence that would best introduce the passage, we can select the following option:
B. In the middle of the San Francisco Bay sits a 400-acre island that, 80 years ago, did not exist.
The passage focuses on the creation of Treasure Island in 1939 for the World's Fair. Treasure Island is now a suburban community. Therefore, we must choose a sentence that properly introduces the topic of the passage, which is Treasure Island.
The only option that does that is letter B. It speaks of a 400-acre island that did not exist 80 years ago - that is, Treasure Island. All the other options focus on other topics, which makes them improper to introduce the passage.
The missing passage necessary to answer this question is the following:
[1] Treasure Island, today a suburban community, was originally created for the 1939 World's Fair. The World's Fair was a celebration of international culture and technology. In the midst of the economic uncertainties of the Great Depression, Treasure Island and its accompanying fair offered a glimpse of optimism and provided San Francisco a platform from which to showcase its latest innovations.
Learn more about introductions here:
https://brainly.com/question/1910346
