The first act of the stage that became wwi was between franz joseph and the
a. croats
c. serbs
b. czechs
d. slovaks

The first act of the stage that became WWI was between Franz Joseph and the Serbs - c.

Franz Joseph basically declared war on the Serbs under the pretense of a treaty which they would have to sign but no actual sovereign nation would want to sign. He knew that his treaty meant war but decided to do that anyway.

Ibelieve it would be homer plessy