43. contagion theory holds a. people are less likely to engage in antisocial behavior in a crowd because they feel they are being observed b. a crowd takes on a life of its own that is larger than the beliefs or actions of any one person c. crowds encourage individuals to take responsibility for themselves and others d. crowds are easily dispersed once the initial contagion p 8. two hundred years ago, about 3 percent of the world’s population lived in cities, compared with today. a. 10 percent b. about 25 percent c. just over 35 percent d. more than 50 percent