The correct answer and the thing that pecos bill invent using a rattlesnake he fights is C. The lasso.
In this story, it is said that Pecos Bill invented the art of being a cowboy and the skill of throwing "a special rope called lasso over a cow's head to catch wandering cattle" and that some say it was made with a rattlesnake. He used a lasso to catch Sue and bring her down to Earth.
