Which of the following explains why a small conflict in the balkans spread to all of europe?

many of the european powers had entered into alliances requiring them to defend each other.
most of the european powers lacked military defenses to stop an attack.
serbia refused all of austria-hungary’s demands, prompting other nations to declare war.
slavs in russia refused to support their fellow slavs in the balkan region.

A)  Many of the European powers had entered into alliances requiring them to defend each other.

Explanation:

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

it may be touching on the issue of over sexualizing all women