Choose the statement(s) that highlights the difference between social movements and other forms of collective behaviors such as fads and fashions. a: crowds and social movements have lasting and more significant effects and last for a longer period of time than fads and fashions. b: crowds and social movements are organized with a common goal, and may even be led by a leader, whereas fads and fashions have neither a common goal nor a leader. c: crowds and social movements are more structured and involve people in physical contact, whereas in fads and fashions people may not be in close contact.