Read the passage from "Wilbur and Orville Wright: Men with Wings" by Dorothy Haas. It was December 17, 1903. Wilbur and Orville Wright had already made three very short flights that morning. They had flown as far as 175 feet, and had been air-borne about twenty seconds on the longest of these flights.

These had been unsteady, up-and-down flights. The plane would rise to fourteen feet from the ground, and then it would dart, suddenly, to within ten feet. The brothers hoped to make a longer flight. They wanted to prove beyond doubt that this was a real, motor-driven flight, and not just a wind-lifted glide.

What is the main idea of the passage?

The brothers had flown 175 feet and had been in the air about twenty seconds.

The plane would rise fourteen feet from the ground and then dart to within ten feet.

Wilbur and Orville had already made three short flights on the morning of December 17.

The Wright brothers wanted to prove that they could complete a motor-driven flight.