What countries comprised the Triple Alliance?

The countries comprised of the Triple Alliance are Germany, Austria-Hungary, and Italy. Thus the correct option is D.

Triple Alliance

Triple Alliance was a diplomatic agreement formed by Germany, Austria-Hungary, and Italy. It was established on May 20th, 1882, and remained in place until 1915, just before World War I.

Germany and Austria-Hungary had a close relationship since 1879. When Italy's goals in North Africa were thwarted by France, Italy sought alliances against France. The Triple Alliance was the result of this collaboration.

Under the terms of the Triple Alliance, Italy pledged support to Germany in case of a conflict with France. Similarly, Germany and Austria-Hungary would support Italy if France attacked Italy without any provocation from the Italian side.

Therefore, the countries that comprised the Triple Alliance were Germany, Italy, and Austria-Hungary.