Final answer:
The Allies, based on the Triple Entente, originally included France, Britain, and Russia, with nations like Italy (which switched sides in 1915), Japan, Belgium, and the United States joining later. Germany, Austria-Hungary, and the Ottoman Empire were part of the Central Powers, not the Triple Entente.
Step-by-step explanation:
Allied Powers in World War I
The Allied Powers in World War I, which were initially based on the Triple Entente of France, Britain, and Russia, were a coalition of nations that opposed the Central Powers. This alliance began to include other nations such as Italy, which switched sides in 1915, and later on Japan, Belgium, and the United States. The original Triple Entente did not include Germany, Austria-Hungary, or the Ottoman Empire—these were part of the opposing coalition known as the Central Powers.
Therefore, the correct answer to which group of countries were the Allies formerly known as the Triple Entente during World War I is option B) France, Russia, and Italy. However, please note that Italy was initially aligned with the Central Powers before joining the Triple Entente, and the United States, though eventually an important Allied Power, was not part of the original Triple Entente.