The problem of elephant destroying trees in Southern Africa is due to competition
In 1914, Archduke Franz Ferdinand of Austria and his wife Sophie are shot to death by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo. The killings sparked a chain of events that led to the outbreak of World War I by early August.
Source: www.history.com
C is the answer. Hope this helps.
When the Aryans ruled over the region