Question

One of the reasons for the outbreak of the Hundred Years' War was the __________.



A: conflict between the French and English branches of the Catholic Church



B rivalry between France and England in Flanders



C attempt by France to cause a rebellion in Ireland



D jealousy of the English for French victories against the Muslims

Answer 1

One of the reasons for the outbreak of the Hundred Years' War was the B. rivalry between France and England in Flanders.
Although Flanders wasn't the only region where there was a high tension between these two countries, it was the most important one because of its wool production, as well as wine trade. 

Answer 2

B rivalry between France and England in Flanders 

The English attempted to control Flanders, an important market for English wool and a source of cloth, which became a source of conflict between both empires.