Which sentence would work as the main idea for an article about famous lion tamers?

Explanation:

In reality, it's the chair that does the important work. When a lion tamer holds a chair in front of the lion's face, the lion tries to focus on all four legs of the chair at the same time. With its focus divided, the lion becomes confused and is unsure about what to do next. ... Clyde Beatty taming a lion with a chair.

from googl*e