Which quotation states where the central idea of the text emerges? a“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)

b“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)

c“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)

d“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