Which quotation states where the central idea of the text emerges?
"On your mark, get set...go! The starter flag drops and the race
is on. While their teams shout encouragement, the competitors
reach their first challenge-a line of sofas." (paragraph 1)
"This unique event is testing the latest assistive technologies for
people with disabilities. While certain technology isn't allowed in
the Olympic or Paralympic games, it's at the heart of the
Cybathlon." (paragraph 2)
"The World Health Organization reports that about 1 billion
people--15 percent of the world's population-have physical
disabilities of some kind." (paragraph 4)
"Some pilots race bikes around the track by controlling their leg
muscles with electrical signals. Others race through a computer
game using the electrical signals they generate with their
brains." (paragraph 6)