challenge: What was Thomas H. Rynning's role in the 1906 Cananea riot in Sonora, Mexico?
  
  A. He was the owner of the Cananea Consolidated Copper Company and was responsible for the strike
  B. He led a group of striking workers in a protest against the Cananea Consolidated Copper Company
  C. He commanded a large posse of American militia to quell the riot and protect American lives and property
  D. He served as a mediator between the strikers and the local officials to negotiate a truce
  Answer: 