Bro u have to write urself
The correct answer is "until".
This is because her opinion changed when she found out what the school would be like. This is why we use until.
When stating a claim you should have supporting facts, and fact-based opinions. You also should have multiple sources of information saying the same claim you are stating, also you should have them cited.
Although the story does not refer to a special name, lets see that the place where Santiago goes fishing is the Caribbean Sea, in a town near Havana Cuba. The hut of Santiago always had proximity to the sea, due to its fishing activity it is perceived that it lived very close to the sea.