The assassination of Austrian Archduke Franz Ferdinand on 28 June 1914 set off a chain of events that led to war in early August 1914.
Answer:
I would go with D, you didn't attach a diagram though
Explanation:
The Maya Civilization developed advanced mathematics. This is one of their main achievements.
They had a slave trade (a is wrong) , the leader was typically an inherited title (b is wrong) , and they definitely traded with other civilizations (c is wrong).
