Final answer:
The three countries that were part of the Axis Powers during World War II were Germany, Japan, and Italy. The United Kingdom was an Ally, not an Axis power.
Step-by-step explanation:
In World War II, the three countries that were part of the Axis Powers were A) Germany, B) Japan, and C) Italy. The United Kingdom, mentioned as option D, was actually a part of the Allied Powers, opposing the Axis. The Axis Powers were forged by shared interests in territorial expansion and a mutual disdain for communism, with each country seeking to expand its influence and control over other territories. The alliance was solidified by the Tripartite Pact of 1941, which was intended to deter the United States from entering the conflict on the side of the Allies, but ultimately, the Japanese attack on Pearl Harbor and Germany's subsequent declaration of war on the US led to an intensification of the global conflict.