The "Axis powers" formally took the name after the Tripartite Pact was signed by Germany, Italy, and Japan on 27 September 1940, in Berlin. The pact was subsequently joined by Hungary (20 November 1940), Romania (23 November 1940), Slovakia (24 November 1940), and Bulgaria (1 March 1941).
it would be a beacause i got it right
A. Serbia
Serbia was the only country involved at the time of the incident, the rest of the countries got involved after or never got involved
