13 which of the following factors triggered the french revolution?
a. use of gunpowder
b. control of west africa
c. a financial crisis
d. napoleon's coup d'etat

C) A financial crisis triggered the French Revolution.

Many factors caused the French revolution but most of them stemmed from poverty and financial crisis. France was divided into three estates which due to some politics and other issues led to social inequalities.  

One cause of the revolution was because the two states had privileges like collecting tithe and paying taxes was not a requirement while the third state paid hefty taxes. Therefore, the third state rebelled in retaliation. Another cause was the financial crisis due to countless battles fought.  

The battles cost France a lot leading to the economic crisis and brink of bankruptcy. These wars include the war which French formed allies with America in the pursuit of American independence. Other factors include poor harvest and increased bread prices. There had been a volcano eruption which led to bad weathers, poor harvest, poverty, and famines. This exasperated the retail price of staple food and other supplies.