Question

which neutral countries border both the central and allied powers? (at least 2)
look closely at great britain: brainstorm or inter- why might their location give them an advantage in wwi?

Explanation:

First Sub - Question (Neutral countries bordering both Central and Allied Powers in WWI)

During World War I, the Central Powers included countries like Germany, Austria - Hungary, etc. The Allied Powers included countries like France, Russia, etc. Switzerland and Sweden (though Sweden's bordering is more nuanced, Switzerland is a clear example) were neutral. Switzerland bordered Germany (Central) and France (Allied), and also Austria - Hungary (Central) and Italy (initially neutral, later Allied). Another could be the Netherlands, but it bordered Germany (Central) and Belgium (Allied, though Belgium was invaded). The most prominent neutral countries bordering both were Switzerland and possibly Sweden (though Sweden's case is less direct in terms of both Central and Allied land borders, Switzerland is a strong example).

Great Britain is an island. Its insular location provided several advantages. Firstly, it was protected from direct land invasions. The English Channel acted as a natural barrier against German ground forces. Secondly, it had a strong naval position. Its location allowed it to control sea lanes, protect its trade routes, and blockade Central Powers. It could also project naval power to support Allied operations in Europe and around the world. Also, its distance from the main European battlefronts (like the Western Front in France/Belgium) meant it could serve as a base for troops, supplies, and production without being as vulnerable to enemy attacks as continental countries.

Answer:

Switzerland, Sweden (Switzerland is a more definitive example as it bordered Germany (Central) and France/Italy (Allied - Italy was initially neutral, later joined Allies); Sweden bordered Germany (Central - via land connection in the north) and Russia (Allied) in a more indirect way, but Switzerland is a key one. Another is the Netherlands, which bordered Germany (Central) and Belgium (Allied, though Belgium was occupied). So two examples are Switzerland and the Netherlands (or Switzerland and Sweden).

Second Sub - Question (Advantage of Great Britain's location in WWI)