Scientific Revolution -The Serbian Rebel Group the Black Hand Perceived Austria as Austria

Scientific Revolution
-The Serbian rebel group the Black Hand perceived Austria as a threat to Serbia because of which of the following?

A) Austria had annexed Bosnia, which they intended to claim.
B) Germany, Austria's ally, had invaded Serbia in the Franco-Prussian War.
C) There was no concrete connection; the Black Hand was incredibly radical.
D) Austria had promised Serbia independence, and then refused to grant it.
E) Archduke Franz Ferdinand was a notoriously oppressive ruler.