Question

Which of the following led directly to the formation of the Mongol empire? The unification of Mongol tribes by Termujin The kidnapping of Termujin’s wife by the Mongol chieftain The payment of tributes to the Mongol army The invention of trebuchet by Mongol engineers

Answer 1

My best bet would be the very first option; Termujin or Genghis Khan (he was born Termunjin but changed it) was very charismatic and gave promises of vast expansion and invasions which was accomplished. 

Answer 2

The unification of Mongol tribes by Termujin led directly to the formation of the Mongol empire. Option A is correct.

The Mongol empire was founded by Genghis Khan in 1206. It streched from the Pacific Ocean in the east to the Danube River and the shores of the Persian Gulf in the west.  It became the largest contiguous land empire in history. The Mongol Empire arised from the unification of several nomadic tribes in the Mongol homeland.