Which was a cause of the hundred years' war? a. france refused to allow english merchant ships to dock in french ports. b. the french king tried to assassinate the english king. c. the english king made claims to the french throne. d. england accused french monks of trying to convert english citizens.

The cause of the Hundred Years War was C) The English king made claims to the French throne. The Hundred Years War was fought because the English had land in France and their were both claims for land in each country as well as claims for the throne. The war heavily depleted the economy of both countries. England was also heavily impacted by the stronger realization that they were an island country and more isolated from the European continent.