You are at a football game with your friends, though you aren't a football fan. Nonetheless, when "the wave" comes your way, you stand up and take part. Afterward, you feel surprised that you did such a silly thing that you don't really even enjoy. A sociologist explains that you were influenced by the behavior of those close to you, which is called ________ theory.
a. convergence
b. mass collective
c. contagion
d. emergent norm