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)