What was the root of the conflict between Serbia and Austria-Hungary that led to the first shots of WWI?

Austria-Hungary wanted Bosnia to be a part of a Greater Austria, however Bosnia was under the control of Serbia.

Serbia was militarizing and threatening to invade Austria-Hungary if they did not agree to cede Bosnia.

Serbia wanted Bosnia to be a part of a Greater Serbia, however Bosnia was under the control of Austria-Hungary.

Austria-Hungary was militarizing and threatening to invade Serbia if they did not agree to cede Bosnia.

The root conflict which uprooted the cause for the first shots of World War I, between Serbia and A-H (Austria and Hungary) was that Serbia wanted Bosnia to be a part of a Greater Serbia, however Bosnia was under the control of Austria-Hungary.

Answer : Option C

Explanation:

Serbia wanted Bosnia, which was annexed by A - H that is, Austria - Hungary in the year 1908, to become the part of a Greater Serbia, however Bosnia was under the control of Austria-Hungary during the year 1908 to 1914 till the advent of World War I.

Black Hand, a militant group who had stance over the ideology of Greater Serbia, took the global crisis to be brought by, by assassinating the Archduke and his wife.

This assassination by Gavrilo Princip who assassinated Archduke Franz Ferdinand in Sarajevo, led to an international global level crisis uprooting the conflict causing the First World War.