which country changed sides about a year after world war i began and joined the allies?\no italy\no…

Brief Explanations:

Before World War I, Italy was part of the Triple - Alliance with Germany and Austria - Hungary. But about a year after the war started in 1914, in 1915, Italy signed the Treaty of London and joined the Allies. France was an original member of the Allies, Germany and Austria - Hungary were part of the Central Powers throughout most of the war.

Answer:

A. Italy