What is a main idea of "Wilbur and Orville Wright: Men with Wings"?

A. The Wright brothers take turns at the controls as they test their gliders.

B. The Wright brothers invent the first motor-powered plane that can truly fly.

C. Along with the Wright brothers, five local seamen work together to test the plane.

D. On the day of their test flight, the wind makes it difficult for the plane to take off.